[jdk17u-dev] RFR: 8291637: HttpClient default keep alive timeout not followed if server sends invalid value

[Goetz Lindenmaier]

I backport this for parity with 17.0.8-oracle.

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Commit messages:
 - Backport b17a745d7f55941f02b0bdde83866aa5d32cce07

Changes: https://git.openjdk.org/jdk17u-dev/pull/1223/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1223&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291637
  Stats: 147 lines in 2 files changed: 147 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1223.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1223/head:pull/1223

PR: https://git.openjdk.org/jdk17u-dev/pull/1223