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/messaging/MessageHandler.java b/core/store/dist/src/main/java/org/onlab/onos/store/messaging/MessageHandler.java
new file mode 100644
index 0000000..8eaef1e
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/messaging/MessageHandler.java
@@ -0,0 +1,16 @@
+package org.onlab.onos.store.messaging;
+
+import java.io.IOException;
+
+/**
+ * Handler for a message.
+ */
+public interface MessageHandler {
+
+ /**
+ * Handles the message.
+ * @param message message.
+ * @throws IOException.
+ */
+ public void handle(Message message) throws IOException;
+}