Add check-requirements job template

check-requirements template run the requirement job
and make sure the consistency of requirements with g-r.

Change-Id: I8bf43979af7bf17a4ff68eb8360244851e363533

Author: Ghanshyam Mann

.zuul.yaml

@@ -1,5 +1,6 @@
 - project:
     templates:
+      - check-requirements
       - horizon-non-primary-django-jobs
       - openstack-python3-ussuri-jobs
       - publish-openstack-docs-pti