Add Patrole gate job for stable/rocky

Now we have stable/rocky branch ready for devstack
and so does for all service projects.

This commit adds the Patrole testing for stable/rocky
by adding new jobs running on stable/rocky version of
openstack.

Depends-On: https://review.openstack.org/#/c/596276/
Change-Id: I522a5bd706723443713bd91270045a37187eff1a
diff --git a/.zuul.yaml b/.zuul.yaml
index 5e6deeb..62800aa 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -87,6 +87,11 @@
         RBAC_TEST_ROLE: member
 
 - job:
+    name: patrole-member-rocky
+    parent: patrole-member
+    override-checkout: stable/rocky
+
+- job:
     name: patrole-member-queens
     parent: patrole-member
     override-checkout: stable/queens
@@ -178,6 +183,7 @@
       jobs:
         - patrole-admin
         - patrole-member
+        - patrole-member-rocky
         - patrole-member-queens
         - patrole-member-pike
         - patrole-py35-member