Add ceilometer specific templates
Add ceilometer specific templates

Following in the footsetps of horizon and neutron add project-templates
for openstack-python-jobs* and periodic-stable-jobs that list ceilometer
as a required-project.

This makes it possible for consumers to list ceilometer in
requirements.txt and still gate/Depends-On in-flight changes

Needed-By: https://review.openstack.org/609823/
Change-Id: I78f09da3b6bf1448b1d28f6e2db581ff72c4127d

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs