Add Gnocchi cache configuration

Change-Id: I897e490842e1890439946103ae04432ecd9d372d
diff --git a/classes/cluster/virtual-mcp11-aio-telemetry/openstack/init.yml b/classes/cluster/virtual-mcp11-aio-telemetry/openstack/init.yml
index 9eef200..6d7af4d 100755
--- a/classes/cluster/virtual-mcp11-aio-telemetry/openstack/init.yml
+++ b/classes/cluster/virtual-mcp11-aio-telemetry/openstack/init.yml
@@ -65,6 +65,11 @@
     server:
       identity:
         protocol: https
+      cache:
+        engine: memcached
+        members:
+        - host: ${_param:single_address}
+          port: 11211
   aodh:
     server:
       bind: