Due to the presence of a "repodata/repomd.xml" path in a kickstart
repo, repo-autoindex previously interpreted kickstart repos as yum
repos. As such, a kickstart repo's index would solely consist of two
directories: "Packages" and "repodata".
While a kickstart repo does contain a yum repo, kickstart repos also
contain two additional repo entry points: treeinfo and extra_files.json.
Each entry point references additional files that should be included
in a kickstart repo's index. These files were previously ignored.
Now, when repo-autoindex encounters a kickstart repo, repo-autoindex
produces a repo index that reflects the content referenced in all
three repo entry points (repomd.xml, treeinfo, extra_files.json).
