code: def list_tokens(self):
          
          resp, resp_body = self.method_get("tokens/%s" % self.token, admin=True)
          if resp.status_code in (401, 403):
              raise exc.AuthorizationFailure("You must be an admin to make this "
                      "call.")
          return resp_body.get("access")
docs: ADMIN ONLY. Returns a dict containing tokens, endpoints, user info, and
          role metadata.