RFR: 8373893: Refactor networking http server tests

[Michael McMahon]

Hi,

This is an update to the httpserver networking tests to change the usage of testng to junit.

Thanks,
Michael

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Commit messages:
 - copyright update
 - output from tool modified for a few files

Changes: https://git.openjdk.org/jdk/pull/28908/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28908&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373893
  Stats: 1063 lines in 31 files changed: 252 ins; 169 del; 642 mod
  Patch: https://git.openjdk.org/jdk/pull/28908.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28908/head:pull/28908

PR: https://git.openjdk.org/jdk/pull/28908