WebUI: Create non editable row widget for mutlivalued widget
    
    Old krb-principal widget is changed to general one. And used also for
    ipacertmapdata in user.
    
    This widget make every line non-editable.
    
    Part of: https://fedorahosted.org/freeipa/ticket/6601
    
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>