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/ClusterMessageHandler.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessageHandler.java
new file mode 100644
index 0000000..15e756d
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/ClusterMessageHandler.java
@@ -0,0 +1,5 @@
+package org.onlab.onos.store.cluster.messaging;
+
+public interface ClusterMessageHandler {
+    public void handle(ClusterMessage message);
+}
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