RFR: Use ThreadGroup for passive connection

[moritz-bruder]

On Fri, 29 Dec 2023 11:15:50 GMT, moritz-bruder <duke at openjdk.org> wrote:

> Passive connections use a separate thread to ensure interruptible IO. Since this is technically part of the test setup it should use a separate ThreadGroup.
> 
> Please let me know if anything else is needed or you want to see any changes. I was trying to follow your processes but found a lot of dead links.

I do not have anything to add.  I am waiting for a review or a discussion.

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PR Comment: https://git.openjdk.org/jtharness/pull/58#issuecomment-1958979300