Refresh a single object from server.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Returns None (updates the object)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the server cannot perform the request

def refresh(self, **kwargs):
        """Refresh a single object from server.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Returns None (updates the object)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabGetError: If the server cannot perform the request
        """
        if self._id_attr:
            path = '%s/%s' % (self.manager.path, self.id)
        else:
            path = self.manager.path
        server_data = self.manager.gitlab.http_get(path, **kwargs)
        self._update_attrs(server_data)