New ro root

- Now the initramfs created by write-hd-image-squash.sh will use an fstab to mount read-write partition to /var and other partitions.
- add packages (and services) for rsyslog, chrony, btrfs-progs and dnsmasq
- copy fsck tools to initramfs root
- update lxc package
- split libblkid out of util-linux, create util-linux-tarball package
- update e2fsprogs package
- add http urls where possible to download without the need to install wget