r02135.vtc test case fixes

This test case should not rely on
first_byte_timeout/between_bytes_timeout.

bin/varnishtest/tests/r02135.vtc

@@ -7,21 +7,15 @@ server s1 {
 	txresp
 	rxreq
 	expect req.url == "/foo"
-	delay 2.5
-	send " "
-	expect_close
+	close
 	accept
 	rxreq
 	expect req.url == "/foo"
 	barrier b1 sync
-	delay 2.5
-	send " "
+	close
 	expect_close
 } -start
 
-varnish v1 -cliok "param.set between_bytes_timeout 1"
-varnish v1 -cliok "param.set first_byte_timeout 1"
-
 varnish v1 -vcl+backend {
 	sub vcl_backend_error {
 		set beresp.http.url = bereq.url;