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: I0fb7872dbc2c295616c319cd7e373dd8e868b028
(cherry picked from commit 82fd8b6109)