RFR: 8280944: Enable Unix domain sockets in Windows Selector notification mechanism [v3]

[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

Michael McMahon has updated the pull request incrementally with one additional commit since the last revision:

  second review comments

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7302/files
  - new: https://git.openjdk.java.net/jdk/pull/7302/files/2e5750c2..a5edc6ce

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7302&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7302&range=01-02

  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 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