This changes the a-r-r with the proper version, and fixes
the repo path for role upgrades:
The role will, during test-upgrade-pre, have its current branch
checked out, and will deploy the current branch infrastructure,
including the generation of the constraints.
Then, the installation of previous branch of the role will use
the constraints for its previous version, but will have no
constraints for it, and fail.
We need to generate the constraints for the previous version too.
This should do it.
Co-Authored-By: Jean-Philippe Evrard <jean-philippe.evrard@rackspace.co.uk>
Change-Id: I8305fce3ea5b6446692d15c642eccd798164f266