Support existing RabbitMQ Celery Broker

[jonnydford]

[barney-s]

Would you care to elaborate this issue ?

[jonnydford]

Celery - and Airflow - supports Redis and RabbitMQ as a broker.

http://docs.celeryproject.org/en/latest/getting-started/first-steps-with-celery.html#choosing-a-broker https://airflow.apache.org/howto/executor/use-celery.html#scaling-out-with-celery

Currently, the airflow-operator only supports Redis as a broker.