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 [v2]

[Daniel Fuchs]

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

Daniel Fuchs has updated the pull request incrementally with one additional commit since the last revision:

  Review feedback; Also removed unused imports

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22278/files
  - new: https://git.openjdk.org/jdk/pull/22278/files/349380d2..3439daab

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22278&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22278&range=00-01

  Stats: 12 lines in 1 file changed: 1 ins; 11 del; 0 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