apply() starts an async disk write and doesn't have a return
value but is otherwise identical in observable effects.
Change-Id: I0f528607319d7eb5136bb11fce0b24d8741ccdf9
Split BluetoothDevice into BluetoothDevice and BluetoothAdapter.
BluetoothAdapter: Represents the local BT adapter. Operations on the local
adapter (start a scan, etc).
BluetoothDevice: Represents a remote BT device. Operations on remote devices
(pair, connect, etc).
In the BroadcastReceiver, pickup the new bluetooth status from the intent instead
of calling back to LocalBluetoothManager. There could be race condition since
LocalBluetoothManager itself gets the same info via the BroadcastReceiver mechanism.
Also cleaned up logs.
