[jdk21u-dev] RFR: 8304065: HttpServer.stop should terminate immediately if no exchanges are in progress

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

Resolved Copyright, priobably clean.

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Commit messages:
 - backport 627ef34498c31b5d16f9da423cfe0a5fe46a3562

Changes: https://git.openjdk.org/jdk21u-dev/pull/2370/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2370&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304065
  Stats: 192 lines in 6 files changed: 82 ins; 58 del; 52 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2370.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2370/head:pull/2370

PR: https://git.openjdk.org/jdk21u-dev/pull/2370