Please review java.util.jar.pack.* exceptions

[Kumar Srinivasan]

Hi,

These are simple changes to the java.util.jar.pack:
   * fixes JCK  failures, specifically throwing unexpected exceptions
   * minor fixes to the ClassFormatException
   * added a new test to catch the JCK type failures up-front, which is
     bulk of the code changes.

http://cr.openjdk.java.net/~ksrini/6985763/webrev.00/

Thanks
Kumar