Updating the Vagrantfile so that builds may be run in an OpenStack
cleanroom instance as well as locally via virtualbox. In order to
properly configure the vagrant instance, a number of environment
variables are utilized. First, all normal OpenStack auth envronment
vars are used to create the instance, and then a host of
GIFTWRAP_OS_* vars are added to control things like the image being
spun up, the networks it is attached to, etc.
A postbuild mechanism is added to allow one to do things like ship
artifacts to a repo, Swift, etc.
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