Updates corresponding to https://github.com/aodn/chef/pull/763

This allows us to keep the same PO/vagrant workflow as we've had, until such time that POs have read access to chef repo (if at all) - at which point this project can be DELETED as can be the associated jenkins job be DELETED (just saying @danfruehauf  :-)

https://github.com/aodn/chef/pull/763