Executes ``ansible-playbook`` against the side_effect playbook and
        returns None.

        :return: None

def side_effect(self):
        """
        Executes ``ansible-playbook`` against the side_effect playbook and
        returns None.

        :return: None
        """
        pb = self._get_ansible_playbook(self.playbooks.side_effect)
        pb.execute()