in the old code,
`self.hm.received_in_ctn(self.config[REMOTE].ctn + 1)`
did not really make sense as "received_in_ctn" compares the argument against the LOCAL ctn
1. Do not perform channel updates in coroutines, because they would get executed in random order.
2. After applying channel updates, wait only for the relevant commitment (local or remote) and not for both, because local and remote might be out of sync (BOLT 2).
3. When waiting for a commitment, wait until a given ctn has been reached, because a queue cannot be shared by several coroutines
