[jdk25u-dev] RFR: 8371366: java/net/httpclient/whitebox/RawChannelTestDriver.java fails intermittently in jtreg timeout

[Roland Mesde]

Backporting JDK-8371366: java/net/httpclient/whitebox/RawChannelTestDriver.java fails intermittently in jtreg timeout.

This PR fixes race conditions and logic bugs causing intermittent timeouts in RawChannelTestDriver.java.

For parity with Oracle JDK.

Ran related tests on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

make test TEST=test/jdk/java/net/httpclient/whitebox/RawChannelTestDriver.java

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Commit messages:
 - Backport 8a7af77e991511e144914abc129a9d4d40c0b76b

Changes: https://git.openjdk.org/jdk25u-dev/pull/202/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=202&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371366
  Stats: 81 lines in 2 files changed: 65 ins; 6 del; 10 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/202.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/202/head:pull/202

PR: https://git.openjdk.org/jdk25u-dev/pull/202