[4.1] 0d95627 Adopt test case to 4.1.

[Lasse Karstensen]

commit 0d956277147d0de9c4bff8cf54bd3d0da1535d30
Author: Lasse Karstensen <lkarsten at varnish-software.com>
Date:   Tue Jun 14 11:18:43 2016 +0200

    Adopt test case to 4.1.

diff --git a/bin/varnishtest/tests/m00024.vtc b/bin/varnishtest/tests/m00024.vtc
index 2124589..93c56ee 100644
--- a/bin/varnishtest/tests/m00024.vtc
+++ b/bin/varnishtest/tests/m00024.vtc
@@ -9,7 +9,7 @@ server s1 {
 } -start
 
 varnish v1 -vcl+backend {
-	import debug;
+	import ${vmod_debug};
 
 	sub vcl_recv {
 		if (!debug.barrier_sync("${b1_sock}")) {