fix cache members for single deploy

Change-Id: Iff3f487f60f522d841bce390afd38d6b2de4e594
diff --git a/metadata/service/control/single.yml b/metadata/service/control/single.yml
index 3741c3f..fe4bca8 100644
--- a/metadata/service/control/single.yml
+++ b/metadata/service/control/single.yml
@@ -43,7 +43,9 @@
         - host: ${_param:single_address}
           port: 9160
       cache:
-        host: ${_param:single_address}
+        members:
+        - host: ${_param:single_address}
+          port: 11211
       identity:
         engine: keystone
         version: '2.0'