JDK 9 RFR of JDK-8156595: java/io/pathNames/GeneralWin32.java fail intermittently on windows-x64

[Amy Lu]

java/io/pathNames/GeneralWin32.java

When tests run concurrently (-conc:N), it’s possible that this test will 
walk into and does some testing on other test’s working dir, other than 
it’s own.

Please review the patch to avoid this unexpected behavior by restricting 
the "checkNames" to test's own working directory.

bug: https://bugs.openjdk.java.net/browse/JDK-8156595
webrev: http://cr.openjdk.java.net/~amlu/8156595/webrev.00

Thanks,
Amy