Add most of code for (efficient) secondary indices on device information

...va/net/floodlightcontroller/core/internal/Controller.java

...oodlightcontroller/devicemanager/IDeviceManagerAware.java

...dlightcontroller/devicemanager/IDeviceManagerService.java

...floodlightcontroller/devicemanager/IEntityClassifier.java

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

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

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

...ntroller/devicemanager/internal/DeviceIndexInterator.java

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

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

...htcontroller/devicemanager/internal/DeviceMultiIndex.java

...tcontroller/devicemanager/internal/DeviceUniqueIndex.java

...t/floodlightcontroller/devicemanager/internal/Entity.java

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

...java/net/floodlightcontroller/routing/ForwardingBase.java

.../java/net/floodlightcontroller/util/IterableIterator.java

...ain/java/net/floodlightcontroller/util/MultiIterator.java

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