Datapath type setting function is required for supporting OVS DPDK addBridge.
The ovs-vsctl command for adding bridge for OVS DPDK is as follows.
Current ONOS BridgeConfig & BridgeDescription does not support datapath type. So..
1. Adding datapath type in BridgeDescription and make it possible to deliver datapath type parameter to OVS
2. Adding datapath type setting function in DefaultOvsdbClient class - addBridge(BridgeDescription bridgeDescription) method.