Fixes: https://github.com/ElementsProject/lightning/issues/4873
In particular, we used to get upset when a peer accepts our channel,
if it was too small! We should do reasonable checks first.
We no longer try to send requests to delay for 2017 blocks though,
so remove that test.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: Protocol: trying to create a channel below our own min-capacity-sat will now fail before asking the peer, not with an error blaming the peer when they accept!
9b68ba0903