0749460652463222de98d67b6b688af2eed1d858
While we're only reacting to containers going away, it's more convenient to bundle the docker events watcher into the server. I've added a flag to switch it on; and switched it on by default in the container. I also implemented `Zone.DeleteRecordsFor(ident)`, which removes all records for a particular container. One minor change to the structure of the code is that the Zone is now constructed *outside* the server, and given to it and the updater.
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