Remove old tarballs from work space in hudson build script.
Remove old tarballs from work space in hudson build script.

pombredanne/paperpile,pombredanne/paperpile,pombredanne/paperpile,pombredanne/paperpile,jondo/paperpile,jondo/paperpile,pombredanne/paperpile,jondo/paperpile,jondo/paperpile,jondo/paperpile