'Destroy a BDM at top level cell.'

def bdm_destroy_at_top(self, ctxt, instance_uuid, device_name=None, volume_id=None):

    method_kwargs = dict(instance_uuid=instance_uuid, device_name=device_name, volume_id=volume_id)
    message = _BroadcastMessage(self, ctxt, 'bdm_destroy_at_top', method_kwargs, 'up', run_locally=False)
    message.process()
