fix std.log() to behave the same in ini/fini and the rest, now that we got a ws

Previously, std.log had printf-semantics for the case that there is no ctx->vsl.

Now, for all cases, it just prints the given STRING_LIST

Fixes the example given in #2063

bin/varnishtest/tests/m00000.vtc

@@ -20,7 +20,7 @@ varnish v1 -vcl+backend {
 		set resp.http.who = debug.author(phk);
 		debug.test_priv_call();
 		debug.test_priv_vcl();
-		std.log("VCL initiated log");
+		std.log("VCL" + " initiated " + "log");
 		std.syslog(8 + 7, "Somebody runs varnishtest");
 		debug.rot52(resp);
 	}
@@ -36,6 +36,20 @@ client c1 {
 	expect resp.http.encrypted == "ROT52"
 } -run
 
+logexpect l1 -v v1 -g raw -d 1 {
+	expect * 1001 VCL_call		{^DELIVER}
+	expect 0 =    RespUnset	{^foo: bAr}
+	expect 0 =    RespHeader	{^foo: BAR}
+	expect 0 =    RespUnset	{^bar: fOo}
+	expect 0 =    RespHeader	{^bar: foo}
+	expect 0 =    RespHeader	{^who: Poul-Henning}
+	expect 0 =    VCL_Log		{^VCL initiated log}
+	expect 0 =    RespHeader	{^Encrypted: ROT52}
+	expect 0 =    VCL_return	{^deliver}
+} -start
+
+logexpect l1 -wait
+
 varnish v1 -errvcl {Wrong enum value.  Expected one of:} {
 	import debug;
 	sub vcl_deliver {

bin/varnishtest/tests/r01924.vtc

@@ -9,16 +9,26 @@ varnish v1 -vcl+backend {
 	import std;
 
 	sub vcl_init {
-		std.log("init");
+		std.log("init" + " one " + "two");
 		std.syslog(8 + 7, "init");
 	}
 
 	sub vcl_fini {
-		std.log("fini");
+		std.log("fini" + " one " + "two");
 		std.syslog(8 + 7, "fini");
 	}
 } -start
 
+logexpect l1 -v v1 -g raw -d 1 {
+	expect 0 0    CLI		{^Rd vcl.load}
+	expect 0 =    VCL_Log		{^init one two}
+
+	expect * 0    CLI		{^Rd vcl.discard}
+	expect 0 =    VCL_Log		{^fini one two}
+} -start
+
 varnish v1 -vcl+backend { }
 
 varnish v1 -cliok "vcl.discard vcl1"
+
+logexpect l1 -wait

lib/libvmod_std/vmod_std.c

@@ -133,27 +133,31 @@ vmod_random(VRT_CTX, VCL_REAL lo, VCL_REAL hi)
 }
 
 VCL_VOID __match_proto__(td_std_log)
-vmod_log(VRT_CTX, const char *fmt, ...)
+vmod_log(VRT_CTX, const char *s, ...)
 {
+	txt t;
 	unsigned u;
 	va_list ap;
-	txt t;
 
 	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
-	va_start(ap, fmt);
-	if (ctx->vsl != NULL) {
-		u = WS_Reserve(ctx->ws, 0);
-		t.b = ctx->ws->f;
-		t.e = VRT_StringList(ctx->ws->f, u, fmt, ap);
-		if (t.e != NULL) {
-			assert(t.e > t.b);
-			t.e--;
-			VSLbt(ctx->vsl, SLT_VCL_Log, t);
-		}
-		WS_Release(ctx->ws, 0);
-	} else
-		VSLv(SLT_VCL_Log, 0, fmt, ap);
+	WS_Assert(ctx->ws);
+
+
+	u = WS_Reserve(ctx->ws, 0);
+	t.b = ctx->ws->f;
+	va_start(ap, s);
+	t.e = VRT_StringList(ctx->ws->f, u, s, ap);
 	va_end(ap);
+
+	if (t.e != NULL) {
+		assert(t.e > t.b);
+		t.e--;
+		if (ctx->vsl != NULL)
+			VSLbt(ctx->vsl, SLT_VCL_Log, t);
+		else
+			VSL(SLT_VCL_Log, 0, "%s", t.b);
+	}
+	WS_Release(ctx->ws, 0);
 }
 
 VCL_VOID __match_proto__(td_std_syslog)