RFR: 8017463: [TEST_BUG] 2 tests from tools/pack200/ remain about 1 GB of data in work directory after execution

[Kumar Srinivasan]

Hi,

Please review changes to cleanup the test area after pack200 test
completion. Some tests generally use large jars and a local copy of the 
JDK to
test with, created a generic utility to nuke most of the remains.

The webrev:
http://cr.openjdk.java.net/~ksrini/8017463/webrev.0/

The bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8017463

Thanks
Kumar