ceilometer_policy.json file was removed as a part of
20ea82b9efe78516286c4b35c5dc644b296b4313 horizon commit made before the
Ocata release due to ceilometer API deprecation.

Having this in a template for Ocata results in an error on first login
via a given http server.

Therefore, this change adds another template for Ocata+ which does not
contain a reference to that file in POLICY_FILES.

Change-Id: I3320622684c3185db45094563f277d4c7ce0694d
Closes-Bug: 1712617