Box packaging

[fgrehm]

metadata.json

{
  "provider": "lxc",
  "version":  "1",

  "template-opts": {
    "--arch":    "amd64",
    "--release": "quantal"
  }
}

KEY	REQUIRED?	DESCRIPTION
provider	Yes	Required by Vagrant
version	Yes	Manifest version, not really useful at the moment but might be in case we add backward incompatibilities
template-opts	No	Extra options to be passed to the template script provided with the .box package

Expected .box conteints

FILE	DESCRIPTION
lxc-template	Script responsible for creating and setting up the container (used with lxc-create)
rootfs.tar.gz	Compressed container rootfs tarball (need to remeber to pass in --numeric-owner when creating it)

[fgrehm]

After a quick spike today, it seems that packaging a previously created container would be just a matter of tweaking the lxc-template and recompressing the rootfs

[fgrehm]

I believe this is a good start, following improvements will be handled by #46