Revert "install.requires: Add fedfind"
    
    This reverts commit d9afa28e8b290c5b95c5c5e052c366e6687799b4. We
    specifically *don't* hard require fedfind as it is only needed
    for the Fedora classes. Note the `extras_require` in setup.py
    called `fedora` that expresses this optional dependency.