Add -u|--unanimous flag: easily identify whether all engines agree on output about eshost-cli HOT 4 CLOSED

I think communicating the hosts with different results via exit code isn't a great design. Probably the stdout should contain this info in an easily parseable format?

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@bterlson Yeah, communication via the exit code was a bit of a stretch. I'd say the output format is not necessarily super important for a first pass at this feature, but an easily-parseable format would definitely be good.

I'm trying to decide whether the current default collated output is not, in fact, easily parseable. I suppose the only problematic things are the colors and if your test output has a line that starts with #### you would be in trouble. Maybe strip the colors and indent the entire output block so only the engine identification lines are left-justified?

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Started work on this here: https://github.com/dilijev/eshost-cli/tree/quorum

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Renaming option to --unanimous as per feedback in #35

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