Avoid checking if "services" tenant is accessible

Attempting to handle the Openstack 401 errors by not checking whether the "services" tenant is an accessible tenant.

We already know that the "services" tenant is a special tenant created specifically for the various openstack services.  The openstack services' users are the only users that should be members of the services tenant.

And, despite the fact that we don't actually throw the 401 error after receiving it, it appears that the underlying libraries nicely log it for us.