multi: make sure CPFP won't exceed max allowed fee rate

This commit updates the `fee()` method in `weightEstimator` to make sure
when doing CPFP we are not exceeding the max allowed fee rate. In order
to use the max fee rate, we need to modify several methods to pass the
configured value to the estimator.

sweep/sweeper.go

@@ -1245,6 +1245,9 @@ func (s *UtxoSweeper) getInputLists(cluster inputCluster,
 		}
 	}
 
+	// Convert the max fee rate's unit from sat/vb to sat/kw.
+	maxFeeRate := s.cfg.MaxFeeRate.FeePerKWeight()
+
 	// If there is anything to retry, combine it with the new inputs and
 	// form input sets.
 	var allSets []inputSet
@@ -1252,8 +1255,8 @@ func (s *UtxoSweeper) getInputLists(cluster inputCluster,
 		var err error
 		allSets, err = generateInputPartitionings(
 			append(retryInputs, newInputs...),
-			cluster.sweepFeeRate, s.cfg.MaxInputsPerTx,
-			s.cfg.Wallet,
+			cluster.sweepFeeRate, maxFeeRate,
+			s.cfg.MaxInputsPerTx, s.cfg.Wallet,
 		)
 		if err != nil {
 			return nil, fmt.Errorf("input partitionings: %v", err)
@@ -1262,8 +1265,8 @@ func (s *UtxoSweeper) getInputLists(cluster inputCluster,
 
 	// Create sets for just the new inputs.
 	newSets, err := generateInputPartitionings(
-		newInputs, cluster.sweepFeeRate, s.cfg.MaxInputsPerTx,
-		s.cfg.Wallet,
+		newInputs, cluster.sweepFeeRate, maxFeeRate,
+		s.cfg.MaxInputsPerTx, s.cfg.Wallet,
 	)
 	if err != nil {
 		return nil, fmt.Errorf("input partitionings: %v", err)
@@ -1294,7 +1297,7 @@ func (s *UtxoSweeper) sweep(inputs inputSet, feeRate chainfee.SatPerKWeight,
 	// Create sweep tx.
 	tx, err := createSweepTx(
 		inputs, nil, s.currentOutputScript, uint32(currentHeight),
-		feeRate, s.cfg.Signer,
+		feeRate, s.cfg.MaxFeeRate.FeePerKWeight(), s.cfg.Signer,
 	)
 	if err != nil {
 		return fmt.Errorf("create sweep tx: %v", err)
@@ -1603,7 +1606,7 @@ func (s *UtxoSweeper) CreateSweepTx(inputs []input.Input, feePref FeePreference,
 
 	return createSweepTx(
 		inputs, nil, pkScript, currentBlockHeight, feePerKw,
-		s.cfg.Signer,
+		s.cfg.MaxFeeRate.FeePerKWeight(), s.cfg.Signer,
 	)
 }