rebalance only checks max-fee-rate at the end

[daywalker90]

Current behaviour is like this: set max-fee-rate to X: bos tries routes where total fee rate is >X or even a single channel demands >X as a fee rate. Then after probing for the amount it exits with RebalanceFeeRateTooHigh. I think it would be better (faster) to skip the route without even trying and continue with another route.

[alexbosworth]

This is by design