mon: paxos: introduce new reset_pending_committing_finishers for safety
There are asserts about the state of the system and pending_finishers which can
be triggered by running arbitrary commands through again. They are correct
when not restarting, but when we do restart we need to take care to preserve
the same invariants as appropriate. Use this function to be careful about
the order of committing_finishers v pending_finishers and to make sure they're
both empty before any Contexts actually get called.
We also reorder a call to finish_contexts on the waiting_for_writeable list for
similar reasons.
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