[fileupload] Download links for 1.6 point to non-existent commons-fileupload2-1.6.0.tar.gz file

All,

On the public web site for fileupload, the download links[1] for version 
1.6.0 point to a URL[2] which is incorrect and leads to a 404 page. It 
looks like all 4 links (tar, zip, src-tar, src-zip) have the same issue.

-chris

[1] 
https://commons.apache.org/proper/commons-fileupload/download_fileupload.cgi
[2] 
https://dlcdn.apache.org//commons/fileupload/binaries/commons-fileupload2-1.6.0-bin.tar.gz