RFR: 8263364: sun/net/www/http/KeepAliveStream/KeepAliveStreamCloseWithWrongContentLength.java wedged in getInputStream [v7]

[Ivan Šipka]

> @dfuch  could you please review, thank you.

Ivan Šipka 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 10 additional commits since the last revision:

 - whitespaces removed
 - Merge branch 'master' into JDK-8263364-keep-alive-should-not-throw-null
 - drain channel impl
 - 8263364: output
 - 8263364: removing surplus imports
 - 8263364: refactor
 - 8263364: refactor
 - 8263364: refactor
 - 8263364: fixed headers
 - JDK-8263364: initial commit

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4472/files
  - new: https://git.openjdk.java.net/jdk/pull/4472/files/478b005d..419e3d31

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4472&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4472&range=05-06

  Stats: 97390 lines in 2145 files changed: 73438 ins; 12983 del; 10969 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4472.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4472/head:pull/4472

PR: https://git.openjdk.java.net/jdk/pull/4472