fix memcached server for keystone

Change-Id: I916b880388afa916cee28cc42492c98331ef84e1
diff --git a/tests/pillar/cluster.sls b/tests/pillar/cluster.sls
index 2f8a6e2..a1984fd 100644
--- a/tests/pillar/cluster.sls
+++ b/tests/pillar/cluster.sls
@@ -41,7 +41,13 @@
       - host: 127.0.0.1
         port: 9160
     cache:
-      host: 127.0.0.1
+      members:
+      - host: 127.0.0.1
+        port: 11211
+      - host: 127.0.0.1
+        port: 11211
+      - host: 127.0.0.1
+        port: 11211
     identity:
       engine: keystone
       version: '2.0'