Comment 3 for bug 1704148

One possible solution until we figure out exactly what is going on would be to revert https://review.openstack.org/#/c/473245/3.

FWIW - I'm not sure how much of a difference this makes yet - but the request to create a request token are getting made to the identity_v2_admin endpoint. Other requests are being made to identity/v3/. I'm sure that just how devstack and tempest are configured though, they should route to the same v3 path.