adding if to grep helps keeping exit code clean
remove echo
add umount of nonfs file systems
if NIC1 is not defined, try it once again

When booting fai-cd in a kvm, is happens that the interfaces has no IP
address yet. Therefore sleep some seconds.
make beta
new code for detecting if DHCP or fixed IP address is needed
make beta
remove unused code for nfsv4
make beta
add moreutils, we need ifdata when using static IP configuration
use ifdata to get IP parameters
move from aprrox to apt-cacher-ng
remove approx config
disable FAI repository by default

I've read this mail
https://lists.uni-koeln.de/pipermail/linux-fai/2013-December/010261.html
remove option -G
fix typo
minor fixes
add code for using an apt proxy by adding variable APTPROXY
faiserver whould use its own apt cache
make beta