Code review request: 7025699: Policy Tool is not accessible by keyboard

[Weijun Wang]

Hi All

Please review the fix at
   http://cr.openjdk.java.net/~weijun/7025699/webrev.00/

The fix includes porting PolicyTool from AWT to Swing, defining 
mnemonics for menu items and buttons, and adding keyboard shortcuts for 
the File -> New/Open/Save items. Several tests are updated also.

Thanks
Max