Add nova metadata for memcache security strategy

Change-Id: I7d093034b640dc9505acae977fbd7b54bd914934
Related-Prod: PROD-22099
diff --git a/defaults/openstack/init.yml b/defaults/openstack/init.yml
index e2856a0..c5464d3 100644
--- a/defaults/openstack/init.yml
+++ b/defaults/openstack/init.yml
@@ -6,3 +6,6 @@
     # for non-ssl use 5672 / for ssl 5671
     openstack_rabbitmq_port: 5672
     openstack_rabbitmq_x509_enabled: False
+    # Openstack memcache security
+    openstack_memcache_security_enabled: False
+    openstack_memcache_security_strategy: 'ENCRYPT'