Fedora 29: No longer build python2-ipaserver
    
    Some Python 2 dependencies such as python2-pki are no longer available
    on Fedora 29. The pki package is a required dependency of
    python2-ipaserver. It's not yet feasible to remove all Python 2
    packages, since fleetcommander is not fully ported to Python 3 yet.
    
    On Fedora 29, python2-ipaserver and python2-ipatests are no longer
    built. The Python 3 packages replace the Python 2 packages.
    
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>