Merge "Adding various new methods to BluetoothGattFacade. 1.Added BluetoothGattServer Callback 2.Added openGattServer method 3.Added gattServerAddService method 4.Added createGattService method 5.Added gattServerCancelConnection method 6.Added bluetoothGattAddCharacteristicToService method 7.Added bluetoothGattCharacteristicAddDescriptor method 8.Added createGattServerCallback method 9.Changed bluetoothGattConfigureMtu to bluetoothGattRequestMtu 10.Changed bluetoothGattRequestConnectionUpdateRequest to bluetoothGattRequestConnectionPriority." into lmp-dev