code: def delete_role_from_user(self, role, user):
          
          uri = "users/%s/roles/OS-KSADM/%s" % (utils.get_id(user),
                  utils.get_id(role))
          resp, resp_body = self.method_delete(uri)
docs: Deletes the specified role from the specified user.
  
          There is no return value upon success. Passing a non-existent role or
          user raises a NotFound exception.