Add redis metadata for gnocchi

Add coordination_backend:redis metadata structure
Add storage:redis metadata structure
Add storage:incomming:redis metadata structure

Set softparams in defaults/openstack/init.yml:

openstack_telemetry_redis_db = 0
openstack_telemetry_redis_sentinel_mastername = 'master_1'

Change-Id: I22f5f849b71a7d7a424dd43472ab6167837b496a
Related-Prod: PROD-29126
diff --git a/gnocchi/common/storage/incoming/redis.yml b/gnocchi/common/storage/incoming/redis.yml
index 9d10bae..77cd6c6 100644
--- a/gnocchi/common/storage/incoming/redis.yml
+++ b/gnocchi/common/storage/incoming/redis.yml
@@ -8,3 +8,13 @@
         incoming:
           driver: ${_param:gnocchi_storage_incoming_driver}
           redis_url: ${_param:gnocchi_storage_incoming_redis_url}
+          redis:
+            password: ${_param:openstack_telemetry_redis_password}
+            user: openstack
+            db: ${_param:gnocchi_redis_db}
+            sentinel:
+              host: ${_param:redis_sentinel_node01_address}
+              master_name: ${_param:gnocchi_redis_sentinel_mastername}
+              fallback:
+                - host: ${_param:redis_sentinel_node02_address}
+                - host: ${_param:redis_sentinel_node03_address}