Add redis metadata for aodh

Add coordination_backend:redis metadata structure

Add the following softparams and set their defaults:
    aodh_redis_db
    aodh_redis_sentinel_mastername

Related-Prod: PROD-29126

Change-Id: I92d31cc5ca54eb1a907895e0a32d9a99b5b0921e
(cherry picked from commit a4946035b0320191b8e8fff786de2e2d39f5cb6a)
2 files changed