Due to a bug in openstacksdk [0], rename the 'token' attribute used for
the auth of the openstack client to 'auth_token'.
'token' was incorrectly set to None by openstacksdk, 'auth_token' is the
same as 'token' but is not impacted by the bug.
[0] https://bugs.launchpad.net/openstacksdk/+bug/2046645
Closes-Bug: #2046711
Change-Id: I9dab5aeb19cf4dc44ff7ee20decf20023b20888b