Bug#569814: debian-installer: Do not install dhcp3* if network is not configured via dhcp
I installed quite a bunch of new (lenny) systems in the last days and always
ended up deinstalling dhcp3-client and -common afterwards.
Since I configured a static network address to each of the boxen, I'd really
like to see d-in not install those dhcp3* packages automagically. Instead
please check whether dhcp network configuration has been chosen and only
then install them.