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

[Ivan Šipka]

@dfuch  could you please review, thank you.

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Commit messages:
 - 8263364: fixed headers
 - JDK-8263364: initial commit

Changes: https://git.openjdk.java.net/jdk/pull/4472/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4472&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263364
  Stats: 67 lines in 1 file changed: 38 ins; 5 del; 24 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