Zuul: add file extension to playbook path
Zuul: add file extension to playbook path

Zuul now supports including the file extension on the playbook path
and omitting the extension is now deprecrated.  Update references
to include the extension.

Change-Id: If8ce35a5c1a93e86308507076f975df5a8b0720e

openstack/vitrage,openstack/vitrage,openstack/vitrage