stage1: remove extlinux because the definition of stage1 has changed
initramfs.init: mount /boot with umask=077, umount /proc and /sys before switch_root
  mount boot with umask: since /boot now uses vfat, this security feature is needed
  umount /sys and /proc: this removes the need to modify rc.boot in write-hd-image-squash
use new prereqs infrastructure for, install services from their packages. Add an sshd meta-service.
write-hd-image-squash.sh: use prereqs to setup rootfs
mdev.conf: rename the uucp group to serial
passwd/group: remove unneeded groups and users
wpa-supplicant: add a service file and default config
iw: remove unneeded CFLAGS from the libnl-tiny patch