Move status_url to webapp config section

This is the last entry standing in the 'zuul' section, it seems
like it may be more appropriate here.

Change-Id: I48d2c4d69025a93a61c4d4fc64574545e3215e2c
diff --git a/tests/fixtures/zuul-push-reqs.conf b/tests/fixtures/zuul-push-reqs.conf
index c5272aa..4faac13 100644
--- a/tests/fixtures/zuul-push-reqs.conf
+++ b/tests/fixtures/zuul-push-reqs.conf
@@ -1,7 +1,7 @@
 [gearman]
 server=127.0.0.1
 
-[zuul]
+[webapp]
 status_url=http://zuul.example.com/status
 
 [merger]