RFR: pr: add hint about 24h exposure for PRs with certain labels

[Robin Westberg]

On Fri, 25 Sep 2020 10:39:27 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that allows the PR bot to show a hint in the integration message that the PR should perhaps
> bit out for review for at least 24 hours if the PR has certain label(s).
> Testing:
> - [x] Added a unit test
> - [x] `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/846