bug#34225: 27.0.50; Add passwd backups to etc-passwd-generic-mode

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  34225-done@debbugs.gnu.org
> Date: Mon, 28 Jan 2019 22:19:39 +0200
> 
> >     /etc/shadow-
> >     Backup file for /etc/shadow.
> >
> >     Note that this file is used by the tools of the shadow toolsuite,
> >     but not by all user and password management tools.
> 
> Yes, and "man 5 passwd" shows the same:
> 
>        /etc/passwd-
>            Backup file for /etc/passwd.
> 
> So I installed the patch to master.

Please add a comment there to explain why we do such a strange thing.