Use new SDP API for OPP

Use new API BluetoothDevice.fetchUuidsWithSdp() to query SDP for un-paired device, and request SDP
update when Opp is not in cache.
Handle a concurrent case when incoming connection and file share happens together
Some other minor changes

Change-Id: I7ebf34801518867553551d8f7bba7ac62e22667e