as discussed in ML, there are MagicNumbers which don't make sense to extract as constant for the sake to make just Checkstyle happy, so MagicNumbers have been reverted - dropped also the constants used only once - and added the related suppressions for interested files

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1457865 13f79535-47bb-0310-9956-ffa450edef68