use backend None instead of bad_ip backend

... for those cases which can easily be changed (most of them).

This avoids issues with failing tests when bad_ip is actually reachable
via tcp on the respective port, as seen for example with b00068.vtc

bin/varnishtest/tests/b00053.vtc

@@ -38,7 +38,7 @@ varnish v1 -expect s_resp_hdrbytes == 178
 varnish v2 -arg "-a ${tmpdir}/v1.sock -b '${bad_backend}'" -start
 
 varnish v2 -syntax 4.0 -errvcl {Compiled VCL version (4.0) not supported.} {
-	backend default { .host = "${bad_ip}"; }
+	backend default None;
 }
 
 varnish v2 -syntax 4.0 -errvcl \
@@ -46,7 +46,7 @@ varnish v2 -syntax 4.0 -errvcl \
 	{backend default { .path = "${tmpdir}/v1.sock"; }}
 
 varnish v3 -vcl {
-	backend default { .host = "${bad_ip}"; }
+	backend default None;
 
 	sub vcl_recv {
 		return(synth(200));

bin/varnishtest/tests/b00068.vtc

@@ -15,7 +15,7 @@ varnish v1 -arg "-p timeout_linger=1"	\
 	import vtc;
 	import blob;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_recv {
 		std.log(blob.encode(encoding=HEX,

bin/varnishtest/tests/c00083.vtc

 varnishtest "Test VSM _.index rewrite when too many deletes"
 
 varnish v1 -vcl {
-	backend default { .host = "${bad_ip}"; }
+	backend default None;
 } -start
 
 delay 1
@@ -17,10 +17,10 @@ process p1 {
 #process p3 {tail -F ${tmpdir}/v1/_.vsm_mgt/_.index} -dump -start
 
 varnish v1 -vcl {
-	backend b00 { .host = "${bad_ip}"; }
-	backend b01 { .host = "${bad_ip}"; }
-	backend b02 { .host = "${bad_ip}"; }
-	backend b03 { .host = "${bad_ip}"; }
+	backend b00 None;
+	backend b01 None;
+	backend b02 None;
+	backend b03 None;
 
 	sub vcl_recv {
 		set req.backend_hint = b00;
@@ -46,26 +46,26 @@ process p1 -run
 # cause a _.index rewrite.
 # Make it 20 to be on the safe side.
 varnish v1 -vcl {
-	backend b00 { .host = "${bad_ip}"; }
-	backend b01 { .host = "${bad_ip}"; }
-	backend b02 { .host = "${bad_ip}"; }
-	backend b03 { .host = "${bad_ip}"; }
-	backend b04 { .host = "${bad_ip}"; }
-	backend b05 { .host = "${bad_ip}"; }
-	backend b06 { .host = "${bad_ip}"; }
-	backend b07 { .host = "${bad_ip}"; }
-	backend b08 { .host = "${bad_ip}"; }
-	backend b09 { .host = "${bad_ip}"; }
-	backend b10 { .host = "${bad_ip}"; }
-	backend b11 { .host = "${bad_ip}"; }
-	backend b12 { .host = "${bad_ip}"; }
-	backend b13 { .host = "${bad_ip}"; }
-	backend b14 { .host = "${bad_ip}"; }
-	backend b15 { .host = "${bad_ip}"; }
-	backend b16 { .host = "${bad_ip}"; }
-	backend b17 { .host = "${bad_ip}"; }
-	backend b18 { .host = "${bad_ip}"; }
-	backend b19 { .host = "${bad_ip}"; }
+	backend b00 None;
+	backend b01 None;
+	backend b02 None;
+	backend b03 None;
+	backend b04 None;
+	backend b05 None;
+	backend b06 None;
+	backend b07 None;
+	backend b08 None;
+	backend b09 None;
+	backend b10 None;
+	backend b11 None;
+	backend b12 None;
+	backend b13 None;
+	backend b14 None;
+	backend b15 None;
+	backend b16 None;
+	backend b17 None;
+	backend b18 None;
+	backend b19 None;
 
 	sub vcl_recv {
 		set req.backend_hint = b00;

bin/varnishtest/tests/c00086.vtc

@@ -60,7 +60,7 @@ shell { chmod go-rx ${tmpdir}/dir }
 
 varnish v8 \
 	-jail "-junix,user=varnish,ccgroup=varnish,workuser=vcache" \
-	-vcl { backend b {.host="${bad_ip}";}
+	-vcl { backend b None;
 }
 
 varnish v8 -cliexpect "(?s)Cannot stat:.+That was just a warning" \

bin/varnishtest/tests/c00087.vtc

@@ -69,7 +69,7 @@ logexpect l1 -v v1 -d 1 -g vxid -q "VCL_acl" {
 } -run
 
 varnish v1 -vcl {
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	acl acl1 {
 		"0.0.0.0";
@@ -97,7 +97,7 @@ client c1 -connect "${tmpdir}/v1.sock" {
 } -run
 
 varnish v1 -errvcl {.../mask is not numeric.} {
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	acl acl1 {
 		"${tmpdir}/v1.sock";

bin/varnishtest/tests/d00032.vtc

@@ -8,7 +8,7 @@ server s1 -listen "${tmpdir}/s1.sock" {
 varnish v1 -vcl {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${s1_sock}");
@@ -19,7 +19,7 @@ varnish v1 -vcl {
 	}
 } -start
 
-varnish v1 -expect MAIN.n_backend == 2
+varnish v1 -expect MAIN.n_backend == 1
 
 client c1 {
 	txreq
@@ -30,7 +30,7 @@ client c1 {
 varnish v1 -errvcl {path must be an absolute path} {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("");
@@ -40,7 +40,7 @@ varnish v1 -errvcl {path must be an absolute path} {
 varnish v1 -errvcl {path must be an absolute path} {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("s1.sock");
@@ -52,7 +52,7 @@ shell { rm -f ${tmpdir}/foo }
 varnish v1 -errvcl {Cannot stat path} {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${tmpdir}/foo");
@@ -62,7 +62,7 @@ varnish v1 -errvcl {Cannot stat path} {
 varnish v1 -errvcl {is not a socket} {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${tmpdir}");

bin/varnishtest/tests/d00033.vtc

@@ -15,7 +15,7 @@ server s2 -listen "${tmpdir}/s2.sock" {
 varnish v1 -vcl {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${s1_sock}");
@@ -30,7 +30,7 @@ varnish v1 -vcl {
 	}
 } -start
 
-varnish v1 -expect MAIN.n_backend == 2
+varnish v1 -expect MAIN.n_backend == 1
 
 client c1 {
 	txreq -url "/foo"

bin/varnishtest/tests/d00034.vtc

@@ -21,7 +21,7 @@ server s2 -listen "${tmpdir}/s2.sock" {
 varnish v1 -vcl {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${s1_sock}");
@@ -36,7 +36,7 @@ varnish v1 -vcl {
 	}
 } -start
 
-varnish v1 -expect MAIN.n_backend == 2
+varnish v1 -expect MAIN.n_backend == 1
 
 client c1 {
 	txreq -url "/foo"

bin/varnishtest/tests/d00035.vtc

@@ -21,7 +21,7 @@ server s2 -listen "${tmpdir}/s2.sock" {
 varnish v1 -vcl {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${s1_sock}");
@@ -37,7 +37,7 @@ varnish v1 -vcl {
 	}
 } -start
 
-varnish v1 -expect MAIN.n_backend == 2
+varnish v1 -expect MAIN.n_backend == 1
 
 client c1 {
 	txreq -url "/foo"

bin/varnishtest/tests/d00036.vtc

@@ -15,7 +15,7 @@ varnish v1 -vcl {
 	import debug;
 	import vtc;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${s1_sock}");
@@ -40,7 +40,7 @@ varnish v1 -vcl {
 	}
 } -start
 
-varnish v1 -expect MAIN.n_backend == 2
+varnish v1 -expect MAIN.n_backend == 1
 
 client c1 {
 	txreq

bin/varnishtest/tests/d00037.vtc

@@ -14,7 +14,7 @@ server s1 -listen "${tmpdir}/s1.sock" {
 varnish v1 -arg "-p thread_pools=1" -vcl {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${s1_sock}");
@@ -31,7 +31,7 @@ client c1 {
 	expect resp.status == 200
 } -start
 
-varnish v1 -expect MAIN.n_backend == 2
+varnish v1 -expect MAIN.n_backend == 1
 
 server s2 -listen "${tmpdir}/s2.sock" {
 	rxreq
@@ -44,7 +44,7 @@ barrier b1 sync
 varnish v1 -vcl {
 	import debug;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s2 = debug.dyn_uds("${s2_sock}");
@@ -61,7 +61,7 @@ barrier b2 sync
 client c1 -wait
 delay 2
 
-varnish v1 -expect MAIN.n_backend == 4
+varnish v1 -expect MAIN.n_backend == 2
 
 varnish v1 -expect n_vcl_avail == 1
 varnish v1 -expect n_vcl_discard == 1

bin/varnishtest/tests/d00038.vtc

@@ -15,7 +15,7 @@ varnish v1 -vcl {
 	import debug;
 	import vtc;
 
-	backend dummy { .host = "${bad_ip}"; }
+	backend dummy None;
 
 	sub vcl_init {
 		new s1 = debug.dyn_uds("${s1_sock}");
@@ -37,7 +37,7 @@ varnish v1 -vcl {
 	}
 } -start
 
-varnish v1 -expect MAIN.n_backend == 2
+varnish v1 -expect MAIN.n_backend == 1
 
 client c1 {
 	txreq

bin/varnishtest/tests/m00033.vtc

@@ -2,7 +2,7 @@ varnishtest "VMOD blob IDENTITY encode and decode"
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00034.vtc

@@ -2,7 +2,7 @@ varnishtest "VMOD blob IDENTITY decode() n chars"
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00035.vtc

@@ -4,7 +4,7 @@ varnishtest "VMOD blob hex encode and decode"
 varnish v1 -arg "-p workspace_client=256k" -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00036.vtc

@@ -3,7 +3,7 @@ varnishtest "VMOD blob hex decode() n chars"
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00037.vtc

@@ -2,7 +2,7 @@ varnishtest "VMOD blob base64 encode and decode"
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));
@@ -126,7 +126,7 @@ client c1 {
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00038.vtc

@@ -2,7 +2,7 @@ varnishtest "VMOD blob base64 decode() n chars"
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00039.vtc

@@ -3,7 +3,7 @@ varnishtest "VMOD blob url encode and decode"
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));
@@ -143,7 +143,7 @@ client c1 {
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00040.vtc

@@ -3,7 +3,7 @@ varnishtest "VMOD blob decode() n chars with URL"
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00041.vtc

@@ -4,7 +4,7 @@ varnishtest "VMOD blob test transcode()"
 varnish v1 -arg "-p workspace_client=256k" -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));
@@ -129,7 +129,7 @@ client c1 {
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));
@@ -274,7 +274,7 @@ client c1 {
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00042.vtc

@@ -3,7 +3,7 @@ varnishtest "VMOD blob test transcode() n chars"
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));
@@ -134,7 +134,7 @@ client c1 {
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));
@@ -270,7 +270,7 @@ client c1 {
 varnish v1 -vcl {
 	import blob;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 	  return(synth(200));

bin/varnishtest/tests/m00043.vtc

@@ -2,7 +2,7 @@ varnishtest "VMOD blob blob object interface"
 
 varnish v1 -arg "-i serverid" -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 	  new id = blob.blob(IDENTITY,
@@ -94,7 +94,7 @@ client c1 -run
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 	  new idempty = blob.blob(IDENTITY, "");
@@ -167,7 +167,7 @@ client c1 -run
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 	  new b64 = blob.blob(BASE64, "L0hlbGxvIHdvcmxkLw==");
@@ -257,7 +257,7 @@ client c2 -run
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 	  new id = blob.blob(IDENTITY,
@@ -455,7 +455,7 @@ logexpect l1 -wait
 
 varnish v1 -errvcl {vmod blob error: cannot create blob err, illegal encoding beginning with "g"} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new err = blob.blob(HEX, "g");
 	}
@@ -463,7 +463,7 @@ varnish v1 -errvcl {vmod blob error: cannot create blob err, illegal encoding be
 
 varnish v1 -errvcl {vmod blob error: cannot create blob bad64, illegal encoding beginning with "-_-_"} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new bad64 = blob.blob(BASE64, "-_-_");
 	}
@@ -471,7 +471,7 @@ varnish v1 -errvcl {vmod blob error: cannot create blob bad64, illegal encoding
 
 varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding beginning with "+/+/"} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new badurl = blob.blob(BASE64URL, "+/+/");
 	}
@@ -479,7 +479,7 @@ varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding
 
 varnish v1 -errvcl {vmod blob error: cannot create blob badpad, illegal encoding beginning with "YWI="} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new badpad = blob.blob(BASE64URLNOPAD, "YWI=");
 	}
@@ -487,7 +487,7 @@ varnish v1 -errvcl {vmod blob error: cannot create blob badpad, illegal encoding
 
 varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding beginning with "%"} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new badurl = blob.blob(URL, "%");
 	}
@@ -495,7 +495,7 @@ varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding
 
 varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding beginning with "%2"} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new badurl = blob.blob(URL, "%2");
 	}
@@ -503,7 +503,7 @@ varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding
 
 varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding beginning with "%q"} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new badurl = blob.blob(URL, "%q");
 	}
@@ -511,7 +511,7 @@ varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding
 
 varnish v1 -errvcl {vmod blob error: cannot create blob badurl, illegal encoding beginning with "%2q"} {
 	import blob;
-	backend b { .host="${bad_ip}"; }
+	backend b None;
 	sub vcl_init {
 	  new badurl = blob.blob(URL, "%2q");
 	}

bin/varnishtest/tests/m00045.vtc

@@ -2,7 +2,7 @@ varnishtest "VMOD blob same(), equal(), length() and sub()"
 
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		new foo1 = blob.blob(IDENTITY, "foobarbazquux");
@@ -168,7 +168,7 @@ client c1 {
 # sub()
 varnish v1 -vcl {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		# Byte values 0 up to 7
@@ -291,7 +291,7 @@ logexpect l1 -v v1 -d 1 -g vxid -q "VCL_Error" {
 # VCL load failures from sub()
 varnish v1 -errvcl {vmod blob error: blob is empty in blob.sub()} {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		new empty = blob.blob(IDENTITY, "");
@@ -303,7 +303,7 @@ varnish v1 -errvcl {vmod blob error: blob is empty in blob.sub()} {
 
 varnish v1 -errvcl {vmod blob error: size 9 from offset 0 requires more bytes than blob length 8 in blob.sub()} {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		new up07 = blob.blob(BASE64, "AAECAwQFBgc=");
@@ -315,7 +315,7 @@ varnish v1 -errvcl {vmod blob error: size 9 from offset 0 requires more bytes th
 
 varnish v1 -errvcl {vmod blob error: size 4 from offset 5 requires more bytes than blob length 8 in blob.sub()} {
 	import blob;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		new up07 = blob.blob(BASE64, "AAECAwQFBgc=");

bin/varnishtest/tests/m00046.vtc

@@ -4,7 +4,7 @@ varnish v1 -arg "-a ${tmpdir}/v1.sock -b '${bad_backend}'" -start
 
 varnish v2 -arg "-a ${tmpdir}/v2.sock" -vcl {
 	import std;
-	backend default { .host = "${bad_ip}"; }
+	backend default None;
 
 	sub vcl_recv {
 		return(synth(200));
@@ -31,7 +31,7 @@ varnish v2 -errvcl {Cannot convert to an IP address: '"${v1_addr}"'} {
 
 varnish v2 -vcl {
 	import std;
-	backend default { .host = "${bad_ip}"; }
+	backend default None;
 
 	sub vcl_recv {
 	    # Silently ignored for a UDS

bin/varnishtest/tests/m00047.vtc

@@ -61,7 +61,7 @@ logexpect l1 -v v1 -d 1 -c {
 varnish v1 -errvcl {vmod unix failure: may not be called in vcl_init or vcl_fini} {
 	import unix;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		std.log(unix.uid());
@@ -71,7 +71,7 @@ varnish v1 -errvcl {vmod unix failure: may not be called in vcl_init or vcl_fini
 varnish v1 -errvcl {vmod unix failure: may not be called in vcl_init or vcl_fini} {
 	import unix;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		std.log(unix.gid());
@@ -81,7 +81,7 @@ varnish v1 -errvcl {vmod unix failure: may not be called in vcl_init or vcl_fini
 varnish v1 -errvcl {vmod unix failure: may not be called in vcl_init or vcl_fini} {
 	import unix;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		std.log(unix.user());
@@ -91,7 +91,7 @@ varnish v1 -errvcl {vmod unix failure: may not be called in vcl_init or vcl_fini
 varnish v1 -errvcl {vmod unix failure: may not be called in vcl_init or vcl_fini} {
 	import unix;
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		std.log(unix.group());

bin/varnishtest/tests/m00049.vtc

@@ -3,7 +3,7 @@ varnishtest "VMOD blob workspace overflow conditions"
 varnish v1 -vcl {
 	import blob;
 	import vtc;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 		if (req.url == "/1") {
@@ -72,7 +72,7 @@ client c4 {
 varnish v1 -vcl {
 	import blob;
 	import vtc;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 		if (req.url == "/1") {
@@ -104,7 +104,7 @@ client c3 -run
 varnish v1 -vcl {
 	import blob;
 	import vtc;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 		if (req.url == "/1") {
@@ -135,7 +135,7 @@ client c3 -run
 varnish v1 -vcl {
 	import blob;
 	import vtc;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 		if (req.url == "/1") {
@@ -166,7 +166,7 @@ client c3 -run
 varnish v1 -vcl {
 	import blob;
 	import vtc;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_miss {
 		if (req.url == "/1") {

bin/varnishtest/tests/m00050.vtc

@@ -2,7 +2,7 @@ varnishtest "std.fnmatch()"
 
 varnish v1 -vcl {
 	import std;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 		return (synth(200));

bin/varnishtest/tests/r02418.vtc

@@ -15,7 +15,7 @@ varnish v1 -cliok "param.set feature +http2"
 varnish v1 -cliok "param.set feature +no_coredump"
 
 varnish v1 -vcl {
-	backend b1 { .host = "${bad_ip}"; }
+	backend b1 None;
 	sub vcl_recv {
 		return (synth(200));
 	}

bin/varnishtest/tests/r02880.vtc

@@ -2,7 +2,7 @@ varnishtest "Long VMOD object names"
 
 varnish v1 -vcl {
 	import debug;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		new l234567890123456789012345678901234567890123456789012345678

bin/varnishtest/tests/v00038.vtc

@@ -132,7 +132,7 @@ varnish v1 -errvcl "Not a socket:" {
 # VCC warns, but does not fail, if stat(UDS) fails with ENOENT.
 shell { rm -f ${tmpdir}/foo }
 
-varnish v1 -vcl { backend b {.host="${bad_ip}";} }
+varnish v1 -vcl { backend b None; }
 
 varnish v1 -cliexpect "(?s)Cannot stat:.+That was just a warning" \
 	{vcl.inline test "vcl 4.1; backend b {.path=\"${tmpdir}/foo\";}"}

bin/varnishtest/tests/v00054.vtc

@@ -35,7 +35,7 @@ client c1 -connect "${tmpdir}/v2.sock" {
 } -run
 
 varnish v3 -arg "-a ${tmpdir}/v3.sock" -vcl {
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_recv {
 		if (req.url == "/nobody") {

bin/varnishtest/tests/v00058.vtc

@@ -2,7 +2,7 @@ varnishtest "Test VRT STRANDS functions"
 
 varnish v1 -arg "-i foobar" -vcl {
 	import debug;
-	backend b { .host = "${bad_ip}"; }
+	backend b None;
 
 	sub vcl_init {
 		# tests VRT_Strands()