试图连接到哨兵（气流celery ）。
不工作：

broker_url = sentinel://127.0.0.0:26379/1
result_backend = sentinel://127.0.0.0:26379/1
[celery_broker_transport_options]
master_name = masterdev

输出：

redis/sentinel.py", line 224, in discover_master
    raise MasterNotFoundError("No master found for %r" % (service_name,))
kombu.exceptions.OperationalError: No master found for None

工作：

broker_url = sentinel://127.0.0.0:26379/1
result_backend = redis://127.0.0.0:5672/1
[celery_broker_transport_options]
master_name = masterdev