adapter: Fix not clearing connectable setting on power off

adapter: Fix not clearing connectable setting on power off

When kernel control of connectable is used daemon doesn't enable
connectable setting unless discoverable. Both settings are permanent
over power toggle unless discoverable timeout was set. In that case
discoverable flag is cleared by kernel on power off. This leads to
connectable flag being left enabled when toggling power on discoverable
adapter with timeout set.

This has some implications on system behaviour:
 - accepting connection from unknown devices
 - not being able to advertise as broadcaster

Since kernel doens't know the reason for enabling connectable flag (and
thus if disable if on power off) this needs to be handled in bluetoothd.

Change-Id: Id454bbd69027affc08a9a11bccfd90e0a2da12a9
Signed-off-by: Amit Purwar <amit.purwar@samsung.com>