Removed Unused Void Class

Removed the class Void.java from
/cloud-framework-ipc/src/org/apache/cloudstack/framework/async/Void.java
since the method public void AsyncMethod(Object realParam,
AsyncCompletionCallback<Void> callback) does not 
exist and it does not seemed to be used in another place.
Also, removed an unnecessary comment in
/cloudstack-framework/ipc/test/org/apache/cloudstack/framework/codestyle/AsyncSampleListenerStyleCaller.java

framework/ipc/src/org/apache/cloudstack/framework/async/Void.java

@@ -1,27 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-package org.apache.cloudstack.framework.async;
-
-/**
- * This is place-holder class to help AsyncMethod to indicate void return value
- * public void AsyncMethod(Object realParam, AsyncCompletionCallback<Void> callback) {
- *
- */
-public class Void {
-}

framework/ipc/test/org/apache/cloudstack/framework/codestyle/AsyncSampleListenerStyleCaller.java

@@ -23,14 +23,5 @@ public class AsyncSampleListenerStyleCaller {
 
     public void MethodThatWillCallAsyncMethod() {
         String vol = new String();
-
-        /*    _ds.createVolume(vol,
-                new AsyncCompletionCallback<String>() {
-                    @Override
-                    public void complete(String resultObject) {
-                        // TODO Auto-generated method stub
-
-                    }
-            });*/
     }
 }