/usr/share/maas/maas_local_celeryconfig_cluster.py is in maas-cluster-controller 1.5.4+bzr2294-0ubuntu1.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/maas/maas_local_celeryconfig_cluster.py
/etc/maas/maas_local_celeryconfig_cluster.py