DemoFamilyRefreshJob runs daily via cron and recreates a demo family from
scratch. This is a managed-mode-only feature (the public hosted instance),
but the job had no app_mode guard, so self-hosted instances were also
creating and refreshing a demo family every day.
This results in every self-host instance of sure getting the demo family
with the well-known credentials created.
It may be worth considering a separate one-time fix that deactivates the
demo family users, and/or entries in the release notes or a separate
security advisories alerting users that they need to deactivate the demo
users.
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