As it was no longer used to answer queries, the old data sources (both
the new API and old sqlite3 stuff) was ripped out. Their configuration
goes with them. The loadzone command, unfortunately, too, because it
handled the old stuff and we don't really have a way to load to
in-memory now (needs #2044/#2046) so it would do nothing anyway.

The configuration options are left in the spec file, because other
modules refer to them. Once the other modules are solved, it can be
removed.