[FLINK-6379] [mesos] Add Mesos ResourceManager (FLIP-6)

- Make the RPC gateway of the ResourceManager extensible to allow for framework-specific RPC methods
- Introduce FLIP-6 MesosResourceManager w/ tests
- Introduce a Mesos-specific RPC gateway for callbacks from child actors and from the Mesos scheduler client
- Enhance the persistent Mesos worker store to track the resource profile associated with a worker
- Convert RegisteredMesosWorkerNode to Java
- Decline TE registration if framework doesn’t recognize the worker

This closes apache#3942.

flink-mesos/src/main/java/org/apache/flink/mesos/runtime/clusterframework/MesosFlinkResourceManager.java

@@ -498,7 +498,7 @@ protected void releasePendingWorker(ResourceID id) {
 	 */
 	@Override
 	protected void releaseStartedWorker(RegisteredMesosWorkerNode worker) {
-		releaseWorker(worker.task());
+		releaseWorker(worker.getWorker());
 	}
 
 	/**