RFR: 8280944: Enable Unix domain sockets in Windows Selector notification mechanism

[Michael McMahon]

Hi,

Could I get the following change reviewed please?

8280233 temporarily disabled AF_UNIX sockets in the windows pipe implementation due to a Windows bug. We would like to re-enable one internal usage of AF_UNIX pipes in the JDK, for the windows NIO selector notification mechanism since this use case does not involve closing the socket and should therefore not encounter the bug.

I haven't included a regression test as this change will exercise tests that are currently running into TCP resource limitations on windows 10 client systems.

Thanks,
Michael

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Commit messages:
 - fixed whitespace
 - further update
 - update variable names
 - fixed problem
 - should build now
 - initial impl

Changes: https://git.openjdk.java.net/jdk/pull/7302/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7302&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280944
  Stats: 32 lines in 3 files changed: 19 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7302.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7302/head:pull/7302

PR: https://git.openjdk.java.net/jdk/pull/7302