'An opportunity to setup flags, before the services are started.'

def _get_flags(self):

    f = {}
    f['osapi_volume_listen'] = {'v': '127.0.0.1'}
    f['osapi_volume_listen_port'] = {'v': 0}
    f['scheduler_driver'] = {'v': 'cinder.scheduler.filter_scheduler.FilterScheduler'}
    return f
