openstacksdk was updated to 0.10.0 which has a different
connection.Connection object, which doesn't take our auth_url.
We should respect the constraints, install the tooling in a venv,
and restrict to a known version of the sdk until more robust code
is written.
Change-Id: I0a8a5ac589b121e3a3ee98979c53340a1467f45c