Use semaphores instead of delays to get the timing right here.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5414 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/tests/c00013.vtc

@@ -6,24 +6,26 @@ server s1 {
 	rxreq
 	expect req.url == "/foo"
 	send "HTTP/1.1 200 Ok\r\nConnection: close\r\n\r\n"
-	delay .5
+	sema r1 sync 2
 	send "line1\n"
-	delay .5
+	sema r1 sync 2
 	send "line2\n"
 } -start
 
 varnish v1 -vcl+backend { } -start
 
 client c1 {
-	txreq -url "/foo"
+	txreq -url "/foo" -hdr "client: c1"
 	rxresp
 	expect resp.status == 200
 	expect resp.http.content-length == 12
 	expect resp.http.x-varnish == "1001"
 } -start
-delay .2
+
 client c2 {
-	txreq -url "/foo"
+	sema r1 sync 2
+	txreq -url "/foo" -hdr "client: c2"
+	sema r1 sync 2
 	rxresp
 	expect resp.status == 200
 	expect resp.http.content-length == 12