[8] Review request for 7162111 change tests run in headless mode [macosx]

[Jason Uh]

Hi,

This fix was for regression tests failing on Mac OS X on remotely 
executed environments. The changed tests now run in headless mode and 
have been taken off the Problem List.

Webrev: http://cr.openjdk.java.net/~juh/7162111/webrev.00/
The CR: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7162111

Note that test/demo/jvmti/mtrace/TraceJFrame.java was not fixed here 
because headless mode is not supported for JFrame. A separate CR will be 
created for this.

Thanks,
Jason