smart card advises: use a wrapper around Bash `for` loops
    
    Replace the raw `command` calls constructing the for loops in some
    methods by a wrapper hiding this detail.
    
    https://pagure.io/freeipa/issue/7036
    
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>