In this commit, we update the close logic to handle re-ogs up to the
final amount of confirmations. This is done generically, so we're able
to handle events such as: coop close confirm, re-org, breach confirm,
re-org, force close confirm, re-org, etc.
The upcoming set of new tests will exercise all of these cases.
We modify the block beat handling to unify the control flow. As it's
possible we get the beat, then see the spend, or the oher way around.
Olaoluwa Osuntokun
12668b8af6