Add stable/queens integration checks

New jobs for d-g can be defined in the local .zuul.yaml as opposed
to project-config. These jobs prevent ensure changes to d-g to not
break stable/queens.

Depends-on: https://review.openstack.org/521888/
Change-Id: I547591607a7726bdef3c3953df9e0bd1c67f3423

.zuul.yaml

@@ -4,10 +4,15 @@
       - name: primary
         label: ubuntu-xenial
 
-
 - project:
     check:
       jobs:
         - devstack:
             files:
               - ^roles/
+        - tempest-full-queens:
+            branches: ^(?!driverfixes/).*$
+            voting: false
+        - tempest-full-queens-py3:
+            branches: ^(?!driverfixes/).*$
+            voting: false