Android: Initiate and monitor pairing requests

Change-Id: I609153841f0c0e2f028c30b6852ff330a1db9d9b
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Android: Add support for detection of connected Bluetooth devices

Change-Id: If174a6e3086aa375e551affa546191c7777864e6
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>