

**Description**

We are using a 3rd party executor which has the ability to use multiple queues, however the `default_queue` is defined under the `celery` heading and is used regardless of the executor that you are using.

See: https://github.com/apache/airflow/blob/2.0.1/airflow/models/baseoperator.py#L366

It would be nice to decouple the default_queue configuration argument away from the celery section to allow other executors to utilise this functionality with less confusion.

**Are you willing to submit a PR?**

Yep! Will open a pull request shortly


**Related Issues**

Not that I'm aware of.

airflow/cli/cli_parser.py
)
ARG_PORT = Arg(
    ("-p", "--port"),
    default=conf.get('webserver', 'WEB_SERVER_PORT'),
    type=int,
    help="The port on which to run the server",
)
ARG_SSL_CERT = Arg(
    ("--ssl-cert",),
    default=conf.get('webserver', 'WEB_SERVER_SSL_CERT'),
    help="Path to the SSL certificate for the webserver",
)
ARG_SSL_KEY = Arg(
    ("--ssl-key",),
    default=conf.get('webserver', 'WEB_SERVER_SSL_KEY'),
    help="Path to the key to use with the SSL certificate",
)
ARG_WORKERS = Arg(
    ("-w", "--workers"),
    default=conf.get('webserver', 'WORKERS'),
    type=int,
    help="Number of workers to run the webserver on",
)
ARG_WORKERCLASS = Arg(
    ("-k", "--workerclass"),
    default=conf.get('webserver', 'WORKER_CLASS'),
    choices=['sync', 'eventlet', 'gevent', 'tornado'],
    help="The worker class to use for Gunicorn",
)
ARG_WORKER_TIMEOUT = Arg(