RFR (XS) 8222410: java/nio/file/attribute/BasicFileAttributeView/UnixSocketFile hangs when "nc" does not accept "-U"

[Aleksey Shipilev]

Test bug:
  https://bugs.openjdk.java.net/browse/JDK-8222410

Fix:
  http://cr.openjdk.java.net/~shade/8222410/webrev.01/

Testing: affected tests on systems that accept/reject -U, jdk-submit (running)

-- 
Thanks,
-Aleksey


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