vtc: Fix c113

I changed Walid's test to make it run faster and created an unfortunate
race condition as a result.

bin/varnishtest/tests/c00113.vtc

@@ -14,7 +14,7 @@ varnish v1 -vcl+backend {
 		.interval = 0.1s;
 		.expect_close = true;
 	}
-} -start
+}
 
 varnish v2 -vcl+backend {
 	probe default {
@@ -24,7 +24,10 @@ varnish v2 -vcl+backend {
 		.interval = 0.1s;
 		.expect_close = false;
 	}
-} -start
+}
+
+varnish v1 -start
+varnish v2 -start
 
 delay 0.5