Make sure the esi parser kicks in.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4035 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/tests/e00013.vtc

@@ -6,7 +6,7 @@ server s1 {
         rxreq
         expect req.url == "/foo"
         txresp -hdr "Connection: close"
-        send {                                         }
+        send {<x>                                      }
 } -start
 
 varnish v1 -vcl+backend {