[jdk17u-dev] RFR: 8291638: Keep-Alive timeout of 0 should close connection immediately

[Goetz Lindenmaier]

I backport this for parity with 17.0.8-oracle.

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Commit messages:
 - Backport 26ac8366360685ef0cf3447ee7db16ba7a7fa1ec

Changes: https://git.openjdk.org/jdk17u-dev/pull/1229/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1229&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291638
  Stats: 40 lines in 4 files changed: 29 ins; 8 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1229.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1229/head:pull/1229

PR: https://git.openjdk.org/jdk17u-dev/pull/1229