[jdk17u-dev] RFR: 8299325: java/net/httpclient/CancelRequestTest.java fails "test CancelRequestTest.testGetSendAsync("https://localhost:46509/https1/x/same/interrupt", true, true)"

[Goetz Lindenmaier]

I backport this to improve testing in 17 and as prereq of JDK-8314136.
Resolved one import, probably clean.

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Commit messages:
 - backport a74ebd048ae569296619c112c23169c46b571863

Changes: https://git.openjdk.org/jdk17u-dev/pull/4101/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4101&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299325
  Stats: 36 lines in 1 file changed: 20 ins; 1 del; 15 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/4101.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4101/head:pull/4101

PR: https://git.openjdk.org/jdk17u-dev/pull/4101