[jdk11u-dev] RFR: 8278067: Make HttpURLConnection default keep alive timeout configurable [v2]

[Goetz Lindenmaier]

> I backport this for parity with 11.0.17-oracle. 
> 
> I had to resolve KeepAliveCache because the indentation differs.

Goetz Lindenmaier has updated the pull request incrementally with one additional commit since the last revision:

  Remove changes to LdapPoolTimeoutTest
  
  They sneaked in from another backport

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

Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/1193/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/1193/files/3604be31..8366f1d2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1193&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1193&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1193.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1193/head:pull/1193

PR: https://git.openjdk.org/jdk11u-dev/pull/1193