py3: temporary set dependencies to both py2 and py3 packages
    
    We are slowly migrating python scripts to py3 and setting py3 as default
    for them. Thus we need to depend on both py2 and py3 packages until
    everything is migrated.
    
    https://pagure.io/freeipa/issue/4985
    
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>