RFR: 8373893: Refactor networking http server tests to use JUnit [v3]

[Michael McMahon]

> Hi,
> 
> This is an update to the httpserver networking tests to change the usage of testng to junit.
> 
> Thanks,
> Michael

Michael McMahon has updated the pull request incrementally with two additional commits since the last revision:

 - review update
 - Apply suggestions from code review
   
   Co-authored-by: Daniel Jelinski <djelinski1 at gmail.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28908/files
  - new: https://git.openjdk.org/jdk/pull/28908/files/126846ff..b596da7f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28908&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28908&range=01-02

  Stats: 5 lines in 3 files changed: 0 ins; 1 del; 4 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