Description of problem:
The /etc/cron.d/smolt crontab is set up to use the smolt username, as of the
update to version 1.1-1, but the smolt package doesn't create this username.  As
a result, cron logs these errors on startup:

Feb 26 17:09:52 localhost crond[2225]: CRON: error in (/etc/cron.d/smolt)
problem is (bad username)

Version-Release number of selected component (if applicable):
1.1-1.fc9.noarch (fc7 & fc8 likely also affected)

How reproducible:
Always

Steps to Reproduce:
1. "yum update" to update to smolt-1.1-1.fc9.noarch.rpm
2. reboot, or restart crond service
3. grep smolt /var/log/cron
  
Actual results:
Feb 26 17:09:52 localhost crond[2225]: CRON: error in (/etc/cron.d/smolt)
problem is (bad username)

Expected results:
No errors, cron reads crontab line and runs smoltSendProfile monthly.

Additional info:
%pre script should do a useradd, as most other packages do when they need a
dedicated username, and %preun script should likely do a userdel.  See rpcbind
or dovecot packages for examples of these.  Some packages (e.g. bind, gdm) don't
do userdel, but it's a bit tidier if they do.