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: I0de68389b0f387b37edaf1bfad3f3b5b1d011873

nihilifer/kolla,rahulunair/kolla,stackforge/kolla,openstack/kolla,stackforge/kolla,nihilifer/kolla,rahulunair/kolla,stackforge/kolla,openstack/kolla