Rollback the last committed configuration.

        :param rb_id: Rollback a specific number of steps. Default: 1

def rollback(self, rb_id=1):
        """
        Rollback the last committed configuration.

        :param rb_id: Rollback a specific number of steps. Default: 1
        """
        rpc_command = '<Unlock/><Rollback><Previous>{rb_id}</Previous></Rollback><Lock/>'.format(rb_id=rb_id)
        self._execute_rpc(rpc_command)