non fedora-usermgmt user creation

[Christian.Iseli at licr.org]

enrico.scholz at informatik.tu-chemnitz.de said:
> > I could live with it.

> This was too early: changes above will not work; when the package,
> shadow-utils and fedora-usermgmt are in the same transaction, fedora-usermgmt
> can be installed *after* the package which would be wrong. 

Actually, my thinking was that fedora-usermgmt should not depend on the 
useradd from shadow-utils but completely replace it.  Of course, it means you 
have to repackage the original useradd in fedora-usermgmt...

Then you have something like:

* 'fedora-usermgmt' gets the following headers:
  |+ Provides: shadow-utils

* every package which creates users will contain something like
  | Requires(pre): shadow-utils
  | ...
  | %pre
  | /usr/sbin/useradd ...