Update DockerSwarmOperator auto_remove to align with DockerOperator

[niklasr22]

The description of the auto_remove field didn't match the field types defined in DockerOperator.
Also "success" and "force" currently don't behave as expected.

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[boring-cyborg]

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[Lee-W]

would it be possible for us to add a unit test for it so that we won't make the same mistake in the future. Thanks!

[niklasr22]

sorry for the review request mess...

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.