This adds `filterlist` files alongside the `fullfilelist` and
`fullfiletimelist` files. These are much, much shorter lists
which skip the entries for packages, ARM device tree boot files
and directories. They are intended for consumption by fedfind,
so it can stop using rync scraping to discover the image files
it looks for. To enable this, we update to a newer version of
`create-filelist` from upstream `quick-fedora-mirror` and make
`update-fullfiletimelist` create the filterlist files as well.
We also delete a couple of old copies of `create-filelist`;
nirik made the two roles that use it share a common copy a few
months back, but missed deleting the copy each role had in its
`files` directory.
