RFR: 8348309: MultiNST tests need more debugging and timing

[Anthony Scarpino]

I need a review of this change that adds new timing controls for the initial server setup.  On rare occasions, more so on certain architectures, the server may not fully start before the client tries to connect.  Additional debugging is added to help identify if there are other timing issues.

Thanks

Tony

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Commit messages:
 - redo import change
 - undo import change
 - fix
 - fix

Changes: https://git.openjdk.org/jdk/pull/23407/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23407&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348309
  Stats: 66 lines in 5 files changed: 19 ins; 10 del; 37 mod
  Patch: https://git.openjdk.org/jdk/pull/23407.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23407/head:pull/23407

PR: https://git.openjdk.org/jdk/pull/23407