fix memcached server for keystone

Change-Id: I916b880388afa916cee28cc42492c98331ef84e1
diff --git a/README.rst b/README.rst
index c0b397e..1e9143d 100644
--- a/README.rst
+++ b/README.rst
@@ -64,7 +64,9 @@
           - 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'
@@ -201,7 +203,13 @@
           - 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'
@@ -354,7 +362,13 @@
           - 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'