* mandos: Use a class decorator instead of a metaclass to provide alternate D-Bus interface names on D-Bus object attributes. (alternate_dbus_interfaces): New class decorator. (AlternateDBusNamesMetaclass, ClientDBusTransitional, MandosDBusServiceTransitional): Removed; all users changed. (ClientDbus, MandosDBusService): Use new "alternate_dbus_interfaces" class decorator.