Some of this code is only needed for backward compatibility - it can be removed when we break compatibility for 1.0.

Works around a bug in Android 7, fixed in 7.1.

Attention: This factors out a DnsModule to be able to make actual
non-Tor DNS lookups for testing.

This now also handles the case where an RSS blog is deleted via the blog
deletion option and not the feed management.

This was preventing introduction messages from getting ACKed.
The introduction tests were modified to check for this.

Signed-off-by: goapunk <noobie@goapunks.net>

Evidently this way of nagging myself to write tests doesn't work.

Also fixed a bug with settings namespaces.