Make HARoleUnsupportedException private to roleChanger

src/main/java/net/floodlightcontroller/core/HARoleUnsupportedException.java

-/**
-*    Copyright 2012, Big Switch Networks, Inc. 
-*    Originally created by David Erickson, Stanford University
-* 
-*    Licensed 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 net.floodlightcontroller.core;
-
-/**
- * Exception is thrown when IOFSwitch does not support HA role request
- * @author shudongz
- */
-public class HARoleUnsupportedException extends Exception {
-    
-    private static final long serialVersionUID = -6854500893864114158L;
-    
-}

src/main/java/net/floodlightcontroller/core/internal/RoleChanger.java

@@ -21,7 +21,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import net.floodlightcontroller.core.FloodlightContext;
-import net.floodlightcontroller.core.HARoleUnsupportedException;
 import net.floodlightcontroller.core.IFloodlightProviderService;
 import net.floodlightcontroller.core.IFloodlightProviderService.Role;
 import net.floodlightcontroller.core.IOFSwitch;
@@ -239,6 +238,12 @@ public class RoleChanger {
         } // end loop
     }
     
+    protected class HARoleUnsupportedException extends Exception {
+        
+        private static final long serialVersionUID = -6854500893864114158L;
+        
+    }
+
     public RoleChanger(IFloodlightProviderService floodlightProvider) {
         this.floodlightProvider = floodlightProvider;
         this.pendingRequestMap = new ConcurrentHashMap<IOFSwitch,