Configure ceilometer coordination backend_url

Add ability to configure ceilometer coordination backend_url from
coordination_backend:redis pillar if enabled

Related-Prod: PROD-29126

Change-Id: I97acb85ae93300102d50dbbd9eb89597b6f1e666
(cherry picked from commit 919b17760bbe1d5553dd3dcf7702ad5a8cb844ff)

Change-Id: I97acb85ae93300102d50dbbd9eb89597b6f1e666
6 files changed