bug#73680: privileged-programs: cant set setuid/setgid to new accounts/groups

[Dariqq]

Regarding the opensmtpd test failure:

THis is completely unrelated to the privileging problem (we invoke the 
unprivilegded one which results in a warning but we dont really use it 
and only check if mail gets delivered)

THe problem is that we check /var/spool/mail for the mail but opensmtpd 
seems to deliver to /var/mail instead.

From the buid log of opensmtpd:
checking system mail directory... /var/mail from _PATH_MAILDIR