In the continuous config stepdown test suites, it is possible for the listCollections sent as part of aggregate to fail if the config server just stepped down.

Aggregate tests which target the config server (for the "admin" or "config" databases) running in such a suite should either be blacklisted or made more robust to these kinds of failures by switching the listCollections call from the legacy networking layer (which does not retry on network errors) to the helpers which provide retries on top of the ASIO networking layer.