Fix crash after simultaneous authentication requests
Fix crash after simultaneous authentication requests

Previously simultaneous authentication requests to the same device caused
bluetoothd crash. Now if ongoing authentication occurs error is returned,
preventing from simultaneous requests to the same device.

pstglia/external-bluetooth-bluez,pkarasev3/bluez,silent-snowman/bluez,ComputeCycles/bluez,silent-snowman/bluez,silent-snowman/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,ComputeCycles/bluez,silent-snowman/bluez,mapfau/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,pstglia/external-bluetooth-bluez,pkarasev3/bluez,pkarasev3/bluez,mapfau/bluez,mapfau/bluez,ComputeCycles/bluez,mapfau/bluez