Add panko metadata for memcache security strategy

Change-Id: Ib14a9f909aabf564a0f2820843d8c2619672afbb
Related-Prod: PROD-23561
diff --git a/panko/server/cluster.yml b/panko/server/cluster.yml
index 354ac58..7c442dd 100644
--- a/panko/server/cluster.yml
+++ b/panko/server/cluster.yml
@@ -43,6 +43,10 @@
           port: 11211
         - host: ${_param:panko_memcached_node03_address}
           port: 11211
+        security:
+          enabled: ${_param:panko_memcache_security_enabled}
+          strategy: ${_param:openstack_memcache_security_strategy}
+          secret_key: ${_param:panko_memcache_secret_key}
       # Check for expired events every day at 2 AM
       expirer:
         cron: