(This was originally filed at: https://bugzilla.redhat.com/show_bug.cgi?id=1103540
Moving here since it's now our proper upstream tracker)

python-bugzilla has a number of config files and caches and it should follow the xdg base dir spec.

References:

http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
http://freedesktop.org/wiki/Software/pyxdg/