code: def list_userpass(self, mount_point='userpass'):
          
          try:
              return self._adapter.get('/v1/auth/{}/users'.format(mount_point), params={'list': True}).json()
          except exceptions.InvalidPath:
              return None
docs: GET /auth/<mount point>/users?list=true
  
          :param mount_point:
          :type mount_point:
          :return:
          :rtype: