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

[Michael McMahon]

> Hi,
> 
> Could I get the following patch reviewed please? (A CSR is also required which I will submit when the docs are agreed)
> 
> It adds a pair of new system properties to make the keep alive timer in java.net.HttpURLConnection configurable.
> The proposed property names are:
> 
> "http.keepAlive.time.server" and "http.keepAlive.time.proxy"
> 
> Thanks,
> Michael

Michael McMahon 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 11 additional commits since the last revision:

 - update after Daniel's first review
 - Merge branch 'master' into keepalive
 - added docs
 - reverted change to LIFETIME constant. Were not necessary
 - updates
 - Merge branch 'master' into keepalive
 - Merge branch 'master' into keepalive
 - Merge branch 'master' into keepalive
 - Merge branch 'master' into keepalive
 - Merge branch 'master' into keepalive
 - ... and 1 more: https://git.openjdk.java.net/jdk/compare/98c4ce4c...edcbb13f

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7349/files
  - new: https://git.openjdk.java.net/jdk/pull/7349/files/85d5662b..edcbb13f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7349&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7349&range=00-01

  Stats: 12764 lines in 314 files changed: 9568 ins; 1658 del; 1538 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7349.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7349/head:pull/7349

PR: https://git.openjdk.java.net/jdk/pull/7349