RFR(XS): JDK-8152679 DeadlockDetectionTest.java fails due to expected output missing

[Dmitry Samersoff]

Everybody,

Please review small changes.

http://cr.openjdk.java.net/~dsamersoff/JDK-8152679/webrev.01/

Test that is not expected to work on OS X, detect OS X and exits.

-Dmitry

-- 
Dmitry Samersoff
Oracle Java development team, Saint Petersburg, Russia
* I would love to change the world, but they won't give me the sources.