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: I96d9772d363305fd65119d1195cc25a508ec33dc

openstack/python-troveclient,openstack/python-troveclient