Code Review Request: 7197662: (prefs) java/util/prefs/AddNodeChangeListener.java fails by timeout or by "couldn't get file lock"

[Kurchi Hazra]

Hi,
The tests in java/util/prefs creates new nodes under the user's home 
directory.
This causes the tests to start out with pre-existing preferences and 
sometimes
leads to interference between the tests. This fix is to change the userRoot
property for each of these tests so these tests create nodes only under the
current directory.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7197662
Webrev: http://cr.openjdk.java.net/~khazra/7197662/webrev.00/

Thanks,
  - Kurchi