It appears that gophercloud's "AllowReauth" AuthOption doesn't actually
do anything, and the keystone/auth token is never refreshed. Eventually
it expires and all OpenStack calls receive HTTP 401 responses.
This change reauthenticates every time the Instances() or
TCPLoadBalancer() API object is requested. This is more frequently than
required, but exposing token expiry information will require gophercloud
surgery.
e14b73bd30