[6.0] 977346eef Skip this test if asan is used

[Dridi Boukelmoune]

commit 977346eef2d6e697540c773f3a02c2ae95598482
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Fri Jun 8 09:40:55 2018 +0100

    Skip this test if asan is used

diff --git a/bin/varnishtest/tests/c00057.vtc b/bin/varnishtest/tests/c00057.vtc
index 09a9c1cd0..ec90cc864 100644
--- a/bin/varnishtest/tests/c00057.vtc
+++ b/bin/varnishtest/tests/c00057.vtc
@@ -1,5 +1,7 @@
 varnishtest	"test sigsegv handler"
 
+feature cmd "test -z $(env | grep ASAN_OPTIONS)"
+
 server s1 {
 	rxreq
 	txresp