fix memcached server for keystone

Change-Id: I916b880388afa916cee28cc42492c98331ef84e1
diff --git a/tests/pillar/single.sls b/tests/pillar/single.sls
index 51b2732..4a253f7 100644
--- a/tests/pillar/single.sls
+++ b/tests/pillar/single.sls
@@ -37,7 +37,9 @@
       - host: 127.0.0.1
         port: 9160
     cache:
-      host: 127.0.0.1
+      members:
+      - host: 127.0.0.1
+        port: 11211
     identity:
       engine: keystone
       version: '2.0'