RFR: 8278067: Make HttpURLConnection default keep alive timeout configurable

[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

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Commit messages:
 - 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
 - initial work

Changes: https://git.openjdk.java.net/jdk/pull/7349/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7349&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278067
  Stats: 252 lines in 4 files changed: 242 ins; 0 del; 10 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