0.5.10.7 release (dennis)
    
    - add stg-koji command and fix up secondary configs (dennis)
    - Merge #2 `Make fedora-cert and fedora-packager-setup work with Python 3`
      (ausil)
    - switch to tar-pax so I can make tarballs (dennis)
    - Make fedora-packager-setup work with Python 3 (ville.skytta)
    - Make fedora-cert work with Python 3 (ville.skytta)
    - Python 3 fixes (ville.skytta)
    
    Signed-off-by: Dennis Gilmore <dennis@ausil.us>