[Rev 02] RFR: 217: Enforce check on number of required reviewers

[Robin Westberg]

On Wed, 22 Jan 2020 13:07:49 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Looks good, particularly the tests!
> 
> Thanks for making the requested update. To check that it matches my understanding, if the default policy as set in `.jcheck/conf` is 1 reviewer with a role of `Reviewer`, then I expect the following:
> 
> `/reviewers 0` -- error
> `/reviewers 1` -- reset to default (1 reviewer with role of `Reviewer` in this example)
> `/reviewers 2` -- num reviewers is now two, one of which must have the role of `Reviewer` and the other must have the role of `Author` (or higher)
> 
> Is my understanding correct? It seems so in looking at your most recent change, but wanted to double-check.

Yep, that's correct!

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PR: https://git.openjdk.java.net/skara/pull/364