[jdk21u-dev] RFR: 8355370: Include server name in HTTP test server thread names to improve diagnostics

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle.

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Commit messages:
 - Backport 7d9a43839ad190a53efdbcc7afd1728760c14e21

Changes: https://git.openjdk.org/jdk21u-dev/pull/1960/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1960&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355370
  Stats: 28 lines in 2 files changed: 13 ins; 6 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1960.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1960/head:pull/1960

PR: https://git.openjdk.org/jdk21u-dev/pull/1960