[jdk17u-dev] RFR: 8298340: java/net/httpclient/CancelRequestTest.java fails with AssertionError: Found some subscribers for testPostInterrupt

[Goetz Lindenmaier]

I backport this for parity with 17.0.17-oracle.

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Commit messages:
 - Backport 05d67f69e34a76702406b36436ddb5db18e8fa68

Changes: https://git.openjdk.org/jdk17u-dev/pull/3674/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3674&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298340
  Stats: 51 lines in 4 files changed: 46 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3674.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3674/head:pull/3674

PR: https://git.openjdk.org/jdk17u-dev/pull/3674