A few things here:
- Source manifests/version.txt directly instead of coreos-version.sh
- Remove Chrome branch from target image directory names.
- Use proper version instead of timestap for catalyst builds.
- Move lsb_release script from coreos-overlay to build_library.
this is a bit of a hack but I wanted to see if it had any utility during
development before making it all pretty. Essentially this is a copy of
build_image but instead of building up an entire image it simply puts
the files into directories on disk to be ran with systemd-nspawn/lxc/etc
