[jdk21u-dev] RFR: 8344346: java/net/httpclient/ShutdownNow.java fails with java.lang.AssertionError: client was still running, but exited after further delay: timeout should be adjusted

[Paul Hohensee]

Backport for parity with Oracle 21.0.8.

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Commit messages:
 - Backport a07b72bfcfa603453ea042e89adeb9dcec8bf63a

Changes: https://git.openjdk.org/jdk21u-dev/pull/1586/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1586&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344346
  Stats: 15 lines in 1 file changed: 2 ins; 11 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1586.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1586/head:pull/1586

PR: https://git.openjdk.org/jdk21u-dev/pull/1586