RFR: 8259628: jdk/net/ExtendedSocketOption/AsynchronousSocketChannelNAPITest.java fails intermittently [v3]

[Patrick Concannon]

> Hi,
> 
> Could someone please review my fix for JDK-8259628: '`jdk/net/ExtendedSocketOption/AsynchronousSocketChannelNAPITest.java` fails intermittently' ?
> 
> `AsynchronousSocketChannelNAPITest` is failing intermittently on Linux due to a race condition caused by not correctly waiting for the result of an asynchronous operation. This fix rectifies this issue and adds additional checks to ensure correct result is received.
> 
> Kind regards,
> Patrick

Patrick Concannon 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 three additional commits since the last revision:

 - Merge remote-tracking branch 'origin/master' into JDK-8259628
 - Merge remote-tracking branch 'origin/master' into JDK-8259628
 - 8259628: jdk/net/ExtendedSocketOption/AsynchronousSocketChannelNAPITest.java fails intermitently

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2162/files
  - new: https://git.openjdk.java.net/jdk/pull/2162/files/313971a1..6bd5efb1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2162&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2162&range=01-02

  Stats: 18 lines in 2 files changed: 0 ins; 18 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2162.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2162/head:pull/2162

PR: https://git.openjdk.java.net/jdk/pull/2162