Add panko metadata for memcache security strategy

Change-Id: Ib14a9f909aabf564a0f2820843d8c2619672afbb
Related-Prod: PROD-23561
diff --git a/defaults/openstack/init.yml b/defaults/openstack/init.yml
index ab31e8d..fa2e921 100644
--- a/defaults/openstack/init.yml
+++ b/defaults/openstack/init.yml
@@ -27,3 +27,6 @@
     # Gnocchi
     gnocchi_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
     gnocchi_memcache_secret_key: ''
+    # Panko
+    panko_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
+    panko_memcache_secret_key: ''
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:
diff --git a/panko/server/single.yml b/panko/server/single.yml
index 5e91db1..dd08349 100644
--- a/panko/server/single.yml
+++ b/panko/server/single.yml
@@ -31,3 +31,8 @@
         cron:
           minute: 0
           hour: 2
+      cache:
+        security:
+          enabled: ${_param:panko_memcache_security_enabled}
+          strategy: ${_param:openstack_memcache_security_strategy}
+          secret_key: ${_param:panko_memcache_secret_key}