Update re-packaged commons-fileupload to 1.2.1

      Done using svn copy from tags in commons so merging future updates should be easier
Changes made/required:
 - All classes in a single renamed package
 - Removed unused Util methods (so even more classes were not required)
 - Removed some deprecated classes
There is almost certainly more to be done in terms of pruning to the minimum required. Will so that once Servlet 3 file upload has been implemented.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@881493 13f79535-47bb-0310-9956-ffa450edef68