Stop using fedora-live-minimization from Python Classroom
    
    From Adam Williamson:
    
    The Python Classroom spin images no longer build in recent Rawhide,
    because of a dnf behaviour change that exposes dependency issues as
    failures rather than hiding them by silently excluding packages. (This
    change will likely get into F29 soon too).
    
    The issue is this. fedora-live-python-classroom.ks includes
    fedora-live-minimization.ks , which does this:
    
    -sane-backends
    
    but it also includes fedora-live-workstation.ks, which includes fedora-
    workstation-common.ks, which does this:
    
    @gnome-desktop
    
    ...and @gnome-desktop includes sane-backends-drivers-scanners and
    libsane-hpaio, which both require sane-backends.
    
    Until recently dnf was simply silently excluding sane-backends-drivers-
    scanners and libsane-hpaio from the image, to 'resolve' this. Now it
    fails on the problem, and we get to make a choice.
    
    You basically have three options:
    
    1. Just drop fedora-live-minimization.ks from fedora-live-python-
    classroom.ks . It's pretty old and random at this point. It's basically
    trying to drop printing and scanning stuff to save a bit of space. Do
    you actually want printing and scanning not to work on your image?
    
    2. Keep fedora-live-minimization.ks but explicitly add back `sane-
    backends` to %packages in fedora-live-python-classroom.ks . This would
    override the exclusion and fix the dep issue, and include the scanning
    bits in the image.
    
    3. Keep fedora-live-minimization.ks and add excludes for sane-backends-
    drivers-scanners and libsane-hpaio to fedora-live-python-classroom.ks .
    This would lose scanning support, and save a bit of space.
    
    I went with option 1.