Merge pull request #616 from rizard/netty4

.../java/net/floodlightcontroller/core/IOFMessageWriter.java

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

...et/floodlightcontroller/core/internal/NullConnection.java

.../net/floodlightcontroller/core/internal/OFConnection.java

...java/net/floodlightcontroller/core/internal/OFSwitch.java

...ain/java/net/floodlightcontroller/util/IterableUtils.java

.../floodlightcontroller/core/internal/MockOFConnection.java

.../floodlightcontroller/core/internal/OFSwitchBaseTest.java

...ightcontroller/core/internal/OFSwitchHandlerTestBase.java

.../net/floodlightcontroller/core/internal/OFSwitchTest.java

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

src/test/java/net/floodlightcontroller/hub/HubTest.java

...oodlightcontroller/learningswitch/LearningSwitchTest.java

...ller/linkdiscovery/internal/LinkDiscoveryManagerTest.java

...t/floodlightcontroller/loadbalancer/LoadBalancerTest.java

...floodlightcontroller/staticflowentry/StaticFlowTests.java

.../floodlightcontroller/util/OFMessageDamperMockSwitch.java