Implement OF switch driver binding

...floodlightcontroller/core/IFloodlightProviderService.java

...n/java/net/floodlightcontroller/core/IOFSwitchDriver.java

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

...et/floodlightcontroller/core/internal/OFChannelState.java

...et/floodlightcontroller/core/internal/ControllerTest.java

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