Add redis metadata for ceilometer

Add coordination_backend:redis metadata structure

Add the following softparams and set their defaults:
  ceilometer_redis_db
  ceilometer_redis_sentinel_mastername

Related-Prod: PROD-29126

Change-Id: I4ed496bae6e93db025980ee88a253a6e06ffa35d
(cherry picked from commit 271c9e75ec9d2a1c42aa2865082fd08071f327ed)
2 files changed