Add gnocchi metadata for memcache security strategy

Change-Id: I3942e861ecce2c75577ed7c0a9c8d5d706e77a73
Related-Prod: PROD-23561
diff --git a/defaults/openstack/init.yml b/defaults/openstack/init.yml
index 468778a..ab31e8d 100644
--- a/defaults/openstack/init.yml
+++ b/defaults/openstack/init.yml
@@ -24,3 +24,6 @@
     # Aodh
     aodh_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
     aodh_memcache_secret_key: ''
+    # Gnocchi
+    gnocchi_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
+    gnocchi_memcache_secret_key: ''