

**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
ActionCommand(
        name='export',
        help='Export all pools',
        func=lazy_load_command('airflow.cli.commands.pool_command.pool_export'),
        args=(ARG_POOL_EXPORT,),
    ),
)
VARIABLES_COMMANDS = (
    ActionCommand(
        name='list',
        help='List variables',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_list'),
        args=(ARG_OUTPUT, ARG_VERBOSE),
    ),
    ActionCommand(
        name='get',
        help='Get variable',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_get'),
        args=(ARG_VAR, ARG_JSON, ARG_DEFAULT, ARG_VERBOSE),
    ),
    ActionCommand(
        name='set',
        help='Set variable',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_set'),
        args=(ARG_VAR, ARG_VAR_VALUE, ARG_JSON),
    ),
    ActionCommand(
        name='delete',
        help='Delete variable',
        func=lazy_load_command('airflow.cli.commands.variable_command.variables_delete'),