/etc/fai/apt/sources.list needs update

[Robert Markula]

Howdy,
in /etc/fai/apt/sources.list there is a reference to
security.geo.debian.org. According to [1], this DNS zone has been
dropped, and security.debian.org should be used instead (Stephan, you
might also want to change this in the Ubuntu FAI PPA).

Cheers,
Robert

[1]
http://dsa.debian.org/dsablog/2010/05/Dropping_security.geo.debian.org_zone/