RFR: JDK-8315213: java/lang/ProcessHandle/TreeTest.java test enhance output of children [v2]

[Roger Riggs]

On Tue, 29 Aug 2023 12:10:34 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> We have some failures in TreeTest.java where the expected number of child processes is differing from what we really get. It would be good to have more output to analyze these cases.
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   use 2 containers for children and descendants

Looks good

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15466#pullrequestreview-1600490400