RFR: 8014855: TEST_BUG: java/nio/file/Files/StreamTest.java fails when sym links not supported

[Henry Jen]

Hi,

Please review a fix for 8014855.

http://cr.openjdk.java.net/~henryjen/tl/8014855.0/webrev/

The fix ensure we only test symbolic link related scenario on systems
support it.

Cheers,
Henry