Prevent Celery from replacing its own module's logging
Prevent Celery from replacing its own module's logging

FIXME: Celery still tampers with the root logger, even with this configuration
set.  We should patch that upstream.  In our case, it doesn't matter much
because we configure lower-level loggers explicitly so the root config doesn't
propagate.

Bug: https://phabricator.wikimedia.org/T182614

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