This ensures that during the RBF process, if one confirms, a re-org occurs, then another confirms, that we'll properly detect this case.
Add a connect/disconnect test when the peers both started up with the rbf coop close feature.
The itest has both sides try to close multiple times, each time with increasing fee rates. We also test the reconnection case, bad RBF updates, and instances where the local party can't actually pay for fees.