Additional work on new device manager

.../java/net/floodlightcontroller/devicemanager/IDevice.java

...dlightcontroller/devicemanager/IDeviceManagerService.java

.../net/floodlightcontroller/devicemanager/IEntityClass.java

...floodlightcontroller/devicemanager/IEntityClassifier.java

...oller/devicemanager/internal/DefaultEntityClassifier.java

...ightcontroller/devicemanager/internal/DeviceIterator.java

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

...lightcontroller/devicemanager/internal/IndexedEntity.java

...loodlightcontroller/core/test/MockFloodlightProvider.java

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

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