[jdk8u-dev] RFR: 8278067: Make HttpURLConnection default keep alive timeout configurable [v4]

[Dhamoder Nalla]

> The JDK11 patch doesn't apply cleanly 1/4 hunks need to be ported manually.
> 
> Test performed:
> 
> 1. JTreg jdk_tier1, hotspot_tier1
> 2. Testcase attached this PR

Dhamoder Nalla has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'master' into Backport-JDK-8278067
 - Remove SystemProperty tag as it is not supported in JDK8
 - Fix indentation
 - Backport d8f44aa39e921594505864e6270f42b745265293
 - Backport of 2e31cc7ee1b875af7c7b3a5367ac8056fbc60650

-------------

Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/437/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/437/files/f44e27ba..4aa85b81

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=437&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=437&range=02-03

  Stats: 5592 lines in 77 files changed: 1494 ins; 3697 del; 401 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/437.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/437/head:pull/437

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