Syncing devices using bigsync. BVS-387

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

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

...ller/devicemanager/internal/DeviceSyncRepresentation.java

src/main/java/org/sdnplatform/sync/IStoreClient.java

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

...lightcontroller/devicemanager/test/MockDeviceManager.java

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

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

...htcontroller/virtualnetwork/VirtualNetworkFilterTest.java