Add barbican metadata for memcache security strategy

Change-Id: I96c1cb1bfacfa5438b6774197cdfdb867154f910
Related-Prod: PROD-23561
diff --git a/defaults/openstack/init.yml b/defaults/openstack/init.yml
index fa2e921..be04d5a 100644
--- a/defaults/openstack/init.yml
+++ b/defaults/openstack/init.yml
@@ -30,3 +30,6 @@
     # Panko
     panko_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
     panko_memcache_secret_key: ''
+    # Barbican
+    barbican_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
+    barbican_memcache_secret_key: ''