RFR: contributor command: better validation of input

[Robin Westberg]

On Tue, 11 Feb 2020 09:03:36 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that adds a bit more strict validation of the input to
> the `/contributor add` command. This is done to ensure that the resulting
> `Co-authored-by` trailer in the final commit message will be approved by jcheck.
> 
> Testing:
> - Added two additional unit tests for validation
> - `make test` passes on Linux x64
> 
> Thanks,
> Erik

Looks good!

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/421