Some work on ip address handling

...dlightcontroller/devicemanager/IDeviceManagerService.java

...t/floodlightcontroller/devicemanager/internal/Device.java

...odlightcontroller/devicemanager/internal/DeviceIndex.java

...tcontroller/devicemanager/internal/DeviceManagerImpl.java

...troller/devicemanager/internal/DeviceManagerImplTest.java

...oodlightcontroller/devicemanager/internal/MockDevice.java

...lightcontroller/devicemanager/test/MockDeviceManager.java

...a/net/floodlightcontroller/forwarding/ForwardingTest.java