Don't use Python dependency generator yet
    
    Fedora 30 started to have python_enable_dependency_generator by default.
    Some packages like python3-dbus don't have the new dist names yet. This
    fix enables testing on rawhide.
    
    https://docs.fedoraproject.org/en-US/packaging-guidelines/Python/
    
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>