Moved ClusterCommunicationService related to api bundle

Change-Id: I0545c2e82824703feff4a089c0de25c9f3969622

 package org.onlab.onos.store.cluster.messaging;
 
+// FIXME: not used any more? remove
 /**
  * Service for encoding & decoding intra-cluster message payload.
  */

@@ -11,6 +11,7 @@ import org.onlab.util.KryoPool;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+//FIXME: not used any more? remove
 /**
  * Factory for parsing messages sent between cluster members.
  */