Potential concern: teardown may return before unswarm

[hamnox]

When tearing down with unswarm set to true, the lines that unswarms the hyperbee and blobs feeds are sometimes never reached. If I recall correctly, Paul verified that network replication would still happen if a hyperbee was unloaded.

If so, that case may need to be unset separately. If replication status can only be set with the feed up, may need to save the setting to apply on the next restart to preserve expected behavior.

https://github.com/pfrazee/ctzn/blob/8202b08f2da1ffe36bbb75557d28b1e602fc7d48/db/base.js#L160-L171