lnwallet: add CommitFee field to OpenChannel

In order to cleanly handle shutdowns and restarts during state machine operation, the fee for the current
commitment transaction must be persisted. This allows the fee to be
reapplied when the current state is reloaded.

lnwallet/reservation.go

@@ -215,6 +215,7 @@ func NewChannelReservation(capacity, fundingAmt btcutil.Amount, minFeeRate btcut
 			TheirBalance: theirBalance,
 			MinFeePerKb:  minFeeRate,
 			Db:           wallet.ChannelDB,
+			CommitFee:    commitFee,
 		},
 		numConfsToOpen: numConfs,
 		pushSat:        pushSat,