feat(OpenStack): Add new scripts to support OpenStack OEM handling

Included are scripts to monitor the CoreOS remote etag, as well as
load a new image into a OpenStack Glance image store.
Why not just include os_release above and so the only magic is for clearing the flag below. It seems reasonable to have images tagged with 'alpha' whether or not you use that to mean the 'latest alpha' or 'all alphas'

Could we set --min-disk based on the size of the image?