[bluez] Reworked rfkill handling. Fixes JB#11460.

Previous patch performed part of the initialization twice for
an rfkilled adapter, meaning that hci events were handled twice.
Modified so that on receiving an rfkill event only try to raise
the adapter up; other initialization has already been done as
part of initializing known adapters.
Merge pull request #16 from hmallat/bluetoothd-handle-rfkilled-adapter-2

[bluez] Reworked rfkill handling. Fixes JB#11460.