[master] 27215f470 use backend None instead of bad ip

[Nils Goroll]

commit 27215f4702cfcecbd534c36841f1d9af5b55387e
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Fri Feb 7 13:54:22 2020 +0100

    use backend None instead of bad ip
    
    Does this stabilize a vtest false negative which I do not understand?

diff --git a/bin/varnishtest/tests/r02946.vtc b/bin/varnishtest/tests/r02946.vtc
index 4801178ad..ecda00483 100644
--- a/bin/varnishtest/tests/r02946.vtc
+++ b/bin/varnishtest/tests/r02946.vtc
@@ -1,7 +1,7 @@
 varnishtest "#2946 - objcore leak for backend_synth"
 
 varnish v1 -vcl {
-	backend bad { .host = "${bad_backend}"; }
+	backend bad None;
 
 	sub vcl_backend_error {
 		if (bereq.http.abandon) {