code: def user_list(self, params=None):
          
  
          uri = 'openstack/users'
          if params:
              uri += '?%s' % urllib.urlencode(params)
  
          resp, body = self.get(uri)
          self.expected_success(200, resp.status)
          body = json.loads(body)
          return rest_client.ResponseBody(resp, body)
docs: Lists all users within the tenant.