RFR: 8373893: Refactor networking http server tests to use JUnit [v5]

[Michael McMahon]

On Wed, 31 Dec 2025 09:18:37 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> No objection to leaving it for another day. There are few other improvements that could be made to these tests with a deeper pass.

I'll file an issue to track that.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28908#discussion_r2655853456