Update glance memcache defaults

Change-Id: I22e2e0c82f05d3a6070c67d1be3711fe5e2402d8
diff --git a/defaults/openstack/init.yml b/defaults/openstack/init.yml
index ba3c682..d80c7d0 100644
--- a/defaults/openstack/init.yml
+++ b/defaults/openstack/init.yml
@@ -15,3 +15,6 @@
     # Nova
     nova_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
     nova_memcache_secret_key: ''
+    # Glance
+    glance_memcache_security_enabled: ${_param:openstack_memcache_security_enabled}
+    glance_memcache_secret_key: ''