Parses /etc/shadow
Author: Lorenzo M. Catucci cat.nosp@m.ucci@ccd.uni.nosp@m.roma2.it
Original Author: Free Ekanayaka fr.nosp@m.ee@64stud.nosp@m.io.com
This file is licensed under the LGPL v2+, like the rest of Augeas.
Each line in the shadow files represents the additional shadow-defined attributes for the corresponding user, as defined in the passwd file.
let entry = [ key word . colon . [ label "password" . sto_to_col? . colon ] . common . eol ]