Fix crash when calling QBluetoothLocalDevice::connectedDevices()

The crash happened on Bluez while no local Bt device is connected.

Change-Id: I418f73b964edc3c302665d4e3374b49a68cfdc46
Reviewed-by: Nedim Hadzic <nedimhadzija@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
QNX Service registered value fix

Once registerService() was called isRegistered() will always return true.
A call to unregisterService() now resets the value.
Cleaning fake server port hash.

Task-number: QTBUG-36626
Change-Id: I452651266192e5773b8330e5f7c02885adff2279
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>