[jdk18] RFR: 8280233: disable Unix domain sockets in PipeImpl

[Michael McMahon]

Hi,

Could I get the following change reviewed please? Pending full investigation of the cause of (JDK-8278369) we want to disable the use of Unix domain sockets in the Windows Pipe implementation, reverting to the previous (pre JDK 16) TCP socket impl. The TCP impl was always used in versions of windows other than 10, 2019 server+ that didn't support Unix domain sockets. There isn't a regression test as existing Pipe tests should be sufficient.

It's not clear at this point if the issue is a JDK or Windows bug but it's expected the Unix domain impl will be restored later. UNIX protocol family SocketChannel/ServerSocketChannels still work after this change.  

Thanks,

Michael.

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Commit messages:
 - update PipeImpl implNote
 - disable Unix domain sockets in PipeImpl

Changes: https://git.openjdk.java.net/jdk18/pull/109/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18&pr=109&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280233
  Stats: 18 lines in 1 file changed: 0 ins; 16 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk18/pull/109.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18 pull/109/head:pull/109

PR: https://git.openjdk.java.net/jdk18/pull/109