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

[Daniel Fuchs]

This test has been observed failing once in our CI. Adjusting the timeout with Utils.adjustTimeout should give the test greater stability.

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Commit messages:
 - 8344346: java/net/httpclient/ShutdownNow.java fails with java.lang.AssertionError: client was still running, but exited after further delay: timeout should be adjusted

Changes: https://git.openjdk.org/jdk/pull/22278/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22278&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344346
  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/22278.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22278/head:pull/22278

PR: https://git.openjdk.org/jdk/pull/22278