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Describe the change you are making here!

Please include tests. Check out these examples:

- https://github.com/mitchellh/packer/blob/master/builder/virtualbox/common/ssh_config_test.go#L19-L37
- https://github.com/mitchellh/packer/blob/master/post-processor/compress/post-processor_test.go#L153-L182

If your PR resolves any open issue(s), please indicate them like this so they will be closed when your PR is merged:

Closes #xxx
Closes #xxx
