Fix celery healthcheck.
Fix celery healthcheck.

mozilla/mozillians,akatsoulas/mozillians,johngian/mozillians,johngian/mozillians,mozilla/mozillians,akatsoulas/mozillians,akatsoulas/mozillians,akatsoulas/mozillians,johngian/mozillians,johngian/mozillians,mozilla/mozillians,mozilla/mozillians