Added Netty based messaging. Updated cluster management to use Netty based messaging
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubscriber.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubscriber.java
index 68cd83c..666ac6d 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubscriber.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/MessageSubscriber.java
@@ -13,6 +13,6 @@
      * @param message    message to be received
      * @param fromNodeId node from which the message was received
      */
-    void receive(ClusterMessage message, NodeId fromNodeId);
+    void receive(Object messagePayload, NodeId fromNodeId);
 
 }