Update Vagrantfile w/ REX-Ray Repo
Update Vagrantfile w/ REX-Ray Repo

This patch updates the Vagrantfile to point to the primary repo and
`master` branch for building REX-Ray.

oppodeldoc/rexray,cduchesne/rexray,codedellemc/rexray,codedellemc/rexray,cduchesne/rexray,oppodeldoc/rexray,oppodeldoc/rexray,thecodeteam/rexray,cduchesne/rexray,thecodeteam/rexray,akutz/rexray,codedellemc/rexray,emccode/rexray,akutz/rexray,akutz/rexray,emccode/rexray,thecodeteam/rexray,thecodeteam/rexray,oppodeldoc/rexray,codedellemc/rexray,cduchesne/rexray,codedellemc/rexray,oppodeldoc/rexray,oppodeldoc/rexray,akutz/rexray,codedellemc/rexray,emccode/rexray,cduchesne/rexray,emccode/rexray,akutz/rexray,cduchesne/rexray,thecodeteam/rexray,akutz/rexray,thecodeteam/rexray