[jdk17u-dev] RFR: 8254786: java/net/httpclient/CancelRequestTest.java failing intermittently

[Goetz Lindenmaier]

I backport this for parity with 17.0.16-oracle.

The original change was pushed in jdk19.
Several later changes were already backported causing conflicts.

src/java.net.http/share/classes/jdk/internal/net/http/Exchange.java
Three later patches were applied. Resolve trivial.

src/java.net.http/share/classes/jdk/internal/net/http/Http2ClientImpl.java
Two later patches were applied. The conflict of hunk 3 is caused by the change of
8328286: Enhance HTTP client in line 103. Resolved.

These and two more files had Copyright conflicts.

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Commit messages:
 - Backport 710653ce1856d13161ae1786d7c5f71997536e78

Changes: https://git.openjdk.org/jdk17u-dev/pull/3334/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3334&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8254786
  Stats: 58 lines in 4 files changed: 43 ins; 6 del; 9 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3334.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3334/head:pull/3334

PR: https://git.openjdk.org/jdk17u-dev/pull/3334