Remove cached featuresReply from OFSwitchImpl

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

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

.../net/floodlightcontroller/core/internal/OFSwitchImpl.java

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

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

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

.../floodlightcontroller/util/OFMessageDamperMockSwitch.java