[5.1] b758894 try to stabilize this test for make -j80 check

[Nils Goroll]

commit b758894297ec967f33fe9fd6af90fcd9ff342313
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Fri Mar 31 17:11:23 2017 +0200

    try to stabilize this test for make -j80 check

diff --git a/bin/varnishtest/tests/r01490.vtc b/bin/varnishtest/tests/r01490.vtc
index 76b32be..88c2550 100644
--- a/bin/varnishtest/tests/r01490.vtc
+++ b/bin/varnishtest/tests/r01490.vtc
@@ -13,6 +13,8 @@ varnish v1 \
 	-vcl+backend {}
 varnish v1 -start
 
+delay 2
+
 varnish v1 -expect threads == 2
 
 logexpect l1 -v v1 -g raw {