Add gnocchi metadata for memcache security strategy

Change-Id: I3942e861ecce2c75577ed7c0a9c8d5d706e77a73
Related-Prod: PROD-23561
diff --git a/gnocchi/server/cluster.yml b/gnocchi/server/cluster.yml
index 7de3ede..1ad5e44 100644
--- a/gnocchi/server/cluster.yml
+++ b/gnocchi/server/cluster.yml
@@ -29,3 +29,7 @@
           port: 11211
         - host: ${_param:gnocchi_memcached_node03_address}
           port: 11211
+        security:
+          enabled: ${_param:gnocchi_memcache_security_enabled}
+          strategy: ${_param:openstack_memcache_security_strategy}
+          secret_key: ${_param:gnocchi_memcache_secret_key}