code: def delete_userpass(self, username, mount_point='userpass'):
          
          return self._adapter.delete('/v1/auth/{}/users/{}'.format(mount_point, username))
docs: DELETE /auth/<mount point>/users/<username>
  
          :param username:
          :type username:
          :param mount_point:
          :type mount_point:
          :return:
          :rtype: