RFR: 1393: PR bot fails on missing .jcheck/conf [v5]

[Erik Joelsson]

On Fri, 4 Nov 2022 17:02:06 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> SKARA-1393 describes a problem related with `.jcheck/conf` missing.
>> 
>> In this patch, when the problem happens, the author of this pull request will get instructions about how to solve this problem.
>
> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Used UncheckedRestException

One more thing. Any time we catch an `InvalidJcheckConfException` and just print a message to the user, we should also log that exception, so that an admin can more easily investigate what went wrong.

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PR: https://git.openjdk.org/skara/pull/1407