Use billiard instead of stdlib multiprocessing
This circumvents a few celery-related issues, and is consistent with what the rest of the codebase does.
Migrated from D5623 (view on Phabricator)
Staging instance, all changes can be removed at any time
This circumvents a few celery-related issues, and is consistent with what the rest of the codebase does.
Migrated from D5623 (view on Phabricator)