IHAListener.roleChanges() now only takes newRole as argument

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

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

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

...ntroller/linkdiscovery/internal/LinkDiscoveryManager.java

...ightcontroller/staticflowentry/StaticFlowEntryPusher.java

...va/net/floodlightcontroller/topology/TopologyManager.java

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

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

...floodlightcontroller/staticflowentry/StaticFlowTests.java

...et/floodlightcontroller/topology/TopologyManagerTest.java