Fetch the Bluetooth name and address without enabling the whole stack

After factory reset and first bootup, fetching the Bluetooth device
name and address is now done without explicitly enabling/disabling
the whole Bluetooth stack.
Apparently, enabling/disabling the whole stack during th first bootup
was somehow holding the kernel wakelock without releasing it.

Also, disable debug log messages for class BluetoothManagerService.

Bug: 21949364
Change-Id: Iffc14f7969d05c1456159d1f4246c53fb5df0f7a