[7u8] Request for review 7162111: change tests run in headless mode [macosx]

[Jason Uh]

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. This is a backport of a recently 
reviewed changeset for JDK8, plus a few more tests that had been 
previously fixed for JDK8.

Webrev: http://cr.openjdk.java.net/~juh/7162111/jdk7u-dev/webrev.00/
CR: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7162111

[ For your reference, the previously reviewed JDK8 changeset:
   http://cr.openjdk.java.net/~juh/7162111/webrev.01/ ]

Thanks,
Jason