RFR: Filing bug, ProblemListing, Backing out [v6]

[Igor Ignatyev]

On Thu, 23 Jul 2020 18:20:10 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> As for the usage of `@ignore`; the keyword is used in ~100 tests, about a third in each of hotspot, jdk, and langtools,
> so it's clearly used. I've added a few words to say that this is a less common use case, but I think the description as
> such should remain.

for the record, the discussion has continued on [the mailing
list](https://mail.openjdk.java.net/pipermail/guide-dev/2020-July/000225.html) (but due to some reasons hasn't been
bridged to this PR), [8249618](https://bugs.openjdk.java.net/browse/JDK-8249618) has been filed to normalize/clean up
usage of `@ignore` vs ProblemList.

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PR: https://git.openjdk.java.net/guide/pull/21