RFR: 8291638: Keep-Alive timeout of 0 should close connection immediately

[Michael McMahon]

Hi

Could I get the following change reviewed please? It fixes an issue identified by the new KeepAliveTest test case where a server returned keep-alive "timeout=0" should have closed the connection, but was reverting to the old defaults.

Thanks,
Michael.

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Commit messages:
 - updated test
 - Merge branch 'master' into keepAliveUpdate
 - Merge branch 'master' into keepAliveUpdate
 - fix without test case update

Changes: https://git.openjdk.org/jdk/pull/10678/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10678&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291638
  Stats: 39 lines in 4 files changed: 29 ins; 8 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10678.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10678/head:pull/10678

PR: https://git.openjdk.org/jdk/pull/10678