Use cliff for CLI layer about stestr HOT 8 CLOSED

@masayukig @mtreinish I will take this issue.

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There might actually be more of a tradeoff here than I originally thought. It is probably worth thoroughly investigating this first to see what the overhead is first. If we can maintain backwards compatibility and don't take a noticeable performance hit then it's probably worth the migration. But, if that's not the case then we should just stick with what's there now I guess.

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I'm actually not sure the overhead, either. But I think it's worth a try :)

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@chkumar246 Are you still thinking to do for this? If not, I'll take this.

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@masayukig Feel free to take it.

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Thanks! I'll do :)

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I think this can be closed with #100 merging now.

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Yep, we're using cliff now so let's close this

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