non fedora-usermgmt user creation

[Christian.Iseli at licr.org]

bugs.michael at gmx.net said:
> Without overriding shadow-utils from the outside, you cannot replace it or
> change its behaviour. Without modifying the dependency chain, you cannot
> influence installation-order either. Hence there's no way to insert a
> configuration package into the depchain.

Ok.

> Technically, packages which run "useradd" require /usr/sbin/useradd in Fedora
> space. They don't require an arbitrary "useradd" in $PATH. They don't require
> a package with the name "shadow-utils". And no other package (not in Core and
> not in Extras either) must replace or otherwise conflict with /usr/sbin/
> useradd unless it is given a different file name.

But something similar is done for e.g. /usr/sbin/sendmail , which is a symlink 
to /etc/alternatives/mta , which offers a way to replace the original sendmail 
with a customized one

> Moving the system utility
> in order to replace it with a modified utility (with different behaviour)
> opens a can of worms. 

Yes, but that's not what I (tried to) propose.