webui: show multiple cert
    
    New certificate widget which replaced certificate status widget.
    
    It can display multiple certs. Drawback is that it cannot display
    if the certificate was revoked. Web UI does not have the information.
    
    part of: https://fedorahosted.org/freeipa/ticket/5045
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>