RFR [9] 8146359: test/java/nio/file/attribute/BasicFileAttributeView/UnixSocketFile.java fails when nc is not available

[Brian Burkhalter]

Please review at your convenience:

Issue:	https://bugs.openjdk.java.net/browse/JDK-8146359
Patch:	http://cr.openjdk.java.net/~bpb/8146359/webrev.00/

The change is to execute ‘which nc’ to check whether ‘nc’ is available and if not then skip the test.

Thanks,

Brian