RFR: jcheck: duplicate-issues should only check id and support "dup"

[Robin Westberg]

On Mon, 23 Mar 2020 09:23:02 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that makes the "duplicate-issues" check in JCheck
> _only_ consider issue ids (e.g. `8123456`) when looking for duplicates. I also
> added support for the "legacy" .jcheck/conf parser to understands the `bugids =
> dup` configuration line.
> 
> Testing:
> - Manual testing 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/533