RFR: 8253207: enable problemlists jcheck's check

[Erik Joelsson]

On Wed, 16 Sep 2020 00:15:54 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

> problemlists[[1]] check verifies that there are no problem-list entries w/ the bug-id used in the commit message.
> 
> [1]: https://github.com/openjdk/skara/pull/518

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/196