fix(coreos-base/coreos-init): bump to simpler motdgen
bump(coreos-base/coreos-cloudinit): bump to 0.7.0

https://github.com/coreos/coreos-cloudinit/releases/tag/v0.7.0
bump(coreos-base/coreos-cloudinit): bump to 0.7.1

https://github.com/coreos/coreos-cloudinit/releases/tag/v0.7.1
bump(coreos-base/coreos-init): Fixes for containers and motdgen
Merge pull request #615 from marineam/container

init and cloudinit updates