/etc/krb5.conf: extensible output generator. Refs #1746
/etc/krb5.conf: Set default realm to uppercase DomainName. Refs #1746
libuser.conf template: libuser DB key is no longer used. Add template fragments and set $conf nested hash. Refs #1749
nsswitch.conf template: dropped DB nsswitch key, using template fragments only. Refs #1746
/etc/pam.d/system-auth-nh template: refactored template with output formatter 90config_expand. Refs #1746