LE/OSX: better use of recently introduced AuthorizationError

handle and GATT_INSUFFICIENT_AUTHENTICATION and GATT_INSUFFICIENT_ENCRYPTION
statuses explicitly to close the established connection with AuthorizationError

Change-Id: I6077d2b4e90daaac527fff7145bc71d7a4e032a3
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>