[jdk8u-dev] RFR: 8291637: HttpClient default keep alive timeout not followed if server sends invalid value

[Dhamoder Nalla]

Backport b17a745d7f55941f02b0bdde83866aa5d32cce07

Clean backport from JDK11u patch.

Test performed:
1. JTreg jdk_tier1
2. JTreg jdk_tier2
3. The backported test case in this PR passed after applying this patch.

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Depends on: https://git.openjdk.org/jdk8u-dev/pull/437

Commit messages:
 - Backport b17a745d7f55941f02b0bdde83866aa5d32cce07

Changes: https://git.openjdk.org/jdk8u-dev/pull/466/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=466&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/jdk8u-dev/pull/466.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/466/head:pull/466

PR: https://git.openjdk.org/jdk8u-dev/pull/466