Drop EoL upstart configuration

[bastelfreak]

Upstart is a legacy init system that's not supported by any of the operating systems that are supported by the docker module.

Summary

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Additional Context

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• [ ] Root cause and the steps to reproduce. (If applicable)
• [ ] Thought process behind the implementation.

Related Issues (if any)

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Checklist

• [ ] 🟢 Spec tests.
• [ ] 🟢 Acceptance tests.
• [ ] Manually verified. (For example puppet apply)