Explicitly install python2-pkgwat-api
    
    For some reason, python2-pkgwat-api conflicts with python-pkgwat-api,
    which shipped with F24. This has been reported[0], but this commit works
    around the issue by explictly using ``python2``.
    
    [0] https://bugzilla.redhat.com/show_bug.cgi?id=1388544
    
    Signed-off-by: Jeremy Cline <jeremy@jcline.org>