Deletes the inventory file used last recently used.

        :param cluster: cluster to clear up inventory file for
        :type cluster: :py:class:`elasticluster.cluster.Cluster`

def cleanup(self, cluster):
        """Deletes the inventory file used last recently used.

        :param cluster: cluster to clear up inventory file for
        :type cluster: :py:class:`elasticluster.cluster.Cluster`
        """
        if self._storage_path and os.path.exists(self._storage_path):
            fname = '%s.%s' % (AnsibleSetupProvider.inventory_file_ending,
                               cluster.name)
            inventory_path = os.path.join(self._storage_path, fname)

            if os.path.exists(inventory_path):
                try:
                    os.unlink(inventory_path)
                    if self._storage_path_tmp:
                        if len(os.listdir(self._storage_path)) == 0:
                            shutil.rmtree(self._storage_path)
                except OSError as ex:
                    log.warning(
                        "AnsibileProvider: Ignoring error while deleting "
                        "inventory file %s: %s", inventory_path, ex)