7197662: (prefs) java/util/prefs/AddNodeChangeListener.java fails by timeout or by "couldn't get file lock"
Summary: Set -Djava.util.prefs.userRoot to current working directory of user in the prefs tests
Reviewed-by: alanb, chegar, weijun, dxu

Reviewed-by: darcy, weijun

Summary: Moved the existing test cases for prefs to open area
Reviewed-by: martin, alanb