Fix md5sums generation for deb packages
Fix md5sums generation for deb packages

The md5sums control file must be formatted exactly as it would be
produced by a run of md5sum (MD5, two spaces, file path). Failing to do
so breaks dpkg --verify.

djhaskin987/fpm,djhaskin987/fpm,djhaskin987/fpm,djhaskin987/fpm