RFR: 8304065: HttpServer.stop should terminate immediately if no exchanges are in progress [v2]

[Mikhail Yankelevich]

> HttpServer::stop will terminate the server immidiately after all exhcnages are complete.
> If the exchanges take longer then the specified delay it will terminate straight after the delay, the same as the previous behaviour.
> 
> Used to wait until the delay is complete at all times, regardless of the number of active exchanges.
> 
> Tests based on @eirbjo work, so adding Eirik as a contributor.

Mikhail Yankelevich has updated the pull request incrementally with one additional commit since the last revision:

  addressing comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25333/files
  - new: https://git.openjdk.org/jdk/pull/25333/files/51fffc94..c924f793

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25333&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25333&range=00-01

  Stats: 133 lines in 3 files changed: 87 ins; 11 del; 35 mod
  Patch: https://git.openjdk.org/jdk/pull/25333.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25333/head:pull/25333

PR: https://git.openjdk.org/jdk/pull/25333