[dns-operations] root? we don't need no stinkin' root!

[Livingood, Jason]

> It doesn't matter. Everything is done in a few days. For a resolver
    updating its copy of the root every month, this is enough to break
    things.

Seems like the answer then is to have the resolver check for updates more frequently. The file is tiny and so this is not in the least going to be resource-intensive. Just check every XX minutes.