Remove spurious interactive-tx commit_sig retransmission
#737
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As pointed out in lightning/bolts#1214, when reconnecting a partially signed `interactive-tx` session, we should set `next_commitment_number` to the current commitment number if we haven't received our peer's `commit_sig`, which tells them they need to retransmit it. More importantly, if our peer behaves correctly and sends us the current commitment number, we must not think that they're late and halt, waiting for them to send `error`. This commit fixes that by allowing our peers to use the current commitment number when they set `next_funding_txid`. Note that we keep retransmitting our `commit_sig` regardless of the value our peer set in `next_commitment_number`, because we need to wait for them to have an opportunity to upgrade. In a future commit we will stop sending spurious `commit_sig`.
We fully implement lightning/bolts#1214 to stop retransmitting `commit_sig` when our peer has already received it. We also correctly set `next_commitment_number` to let our peer know whether we have received their `commit_sig` or not.
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We fully implement lightning/bolts#1214 to stop retransmitting
commit_sigwhen our peer has already received it. We also correctly setnext_commitment_numberto let our peer know whether we have received theircommit_sigor not.Builds on top of #736: should only be merged once ACINQ/eclair#2966 has been deployed to the ACINQ node.