[6.0] 613ab495c check if this stabilizes the test

[Dridi Boukelmoune]

commit 613ab495c7299e4122a02a053a9b89a31727da3e
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Thu Aug 30 17:59:35 2018 +0200

    check if this stabilizes the test

diff --git a/bin/varnishtest/tests/b00064.vtc b/bin/varnishtest/tests/b00064.vtc
index 6054ec1e6..09daf9b09 100644
--- a/bin/varnishtest/tests/b00064.vtc
+++ b/bin/varnishtest/tests/b00064.vtc
@@ -83,7 +83,7 @@ client c2 {
 	expect resp.http.X-req-grace < 0.
 } -start
 
-delay .1
+delay .2
 
 # c3 asks for graced object, but now we disable grace.
 client c3 {