atomic: use kojipkgs url everywhere
    
    We need to use the kojipkgs url on the builders because they don't
    have access to dl.fp.o. After some discussion we have just decided
    to use the kojipkgs url everywhere as the dl.fp.o url is just a
    redirect anyway.
    
    Signed-off-by: Dusty Mabe <dusty@dustymabe.com>