Deprecate PortNumberCache (OF Plugin Cluster Ready) but create NodeConnectorRefToPortTranlator

Create class NodeConnectorRefToPortTranlator with two methods:
a/ toNodeConnectorRef
input: DeviceState
output: NodeConnectorRef
b/ fromNodeConnectorRef
input: DeviceState, NodeConnectorRef
output: Long

While implementing these methods use org.opendaylight.openflowplugin.openflow.md.util.InventoryDataServiceUtil (this is allready used by the cache).

After that remove this cluster buggy (Please, annotate these methods as Deprecated):

• org.opendaylight.openflowplugin.api.openflow.device.PortNumberCache.lookupNodeConnectorRef(Long)
• org.opendaylight.openflowplugin.api.openflow.device.PortNumberCache.storeNodeConnectorRef(Long, NodeConnectorRef)

Stop using these deprecated methods in d/ org.opendaylight.openflowplugin.impl.translator.PacketReceivedTranslator.