Prevent installation of Py2 and Py3 mod_wsgi
    
    FreeIPA is either compatible with Python 2 mod_wsgi or Python 3
    mod_wsgi. mod_wsgi can not coexist in the same Apache process as
    mod_wsgi_python3. When both mod_wsgi and python3-mod_wsgi are installed,
    the first loaded module wins and the other one is never loaded.
    
    Add conflict on the other module to prevent installation of both
    modules.
    
    https://pagure.io/freeipa/issue/7161
    
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>