[jdk26u] RFR: 8373893: Refactor networking http server tests to use JUnit

[Vanitha B P]

Clean Backport, all tests passed.

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Commit messages:
 - Backport 96e5c270b4ca0ad2b47ef3c090cbbfe4661bfc22

Changes: https://git.openjdk.org/jdk26u/pull/71/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk26u&pr=71&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373893
  Stats: 1079 lines in 31 files changed: 180 ins; 139 del; 760 mod
  Patch: https://git.openjdk.org/jdk26u/pull/71.diff
  Fetch: git fetch https://git.openjdk.org/jdk26u.git pull/71/head:pull/71

PR: https://git.openjdk.org/jdk26u/pull/71