multi: add new config option BudgetConfig and NoDeadlineConfTarget

This commit adds a new group config `BudgetConfig` to allow users
specifying their own preference when sweeping outputs. And a new config
option `NoDeadlineConfTarget` is added in case the user wants to use a
different "lazy" conf target.

config.go

@@ -42,7 +42,6 @@ import (
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/routing"
 	"github.com/lightningnetwork/lnd/signal"
-	"github.com/lightningnetwork/lnd/sweep"
 	"github.com/lightningnetwork/lnd/tor"
 )
 
@@ -689,9 +688,7 @@ func DefaultConfig() Config {
 		RemoteSigner: &lncfg.RemoteSigner{
 			Timeout: lncfg.DefaultRemoteSignerRPCTimeout,
 		},
-		Sweeper: &lncfg.Sweeper{
-			MaxFeeRate: sweep.DefaultMaxFeeRate,
-		},
+		Sweeper: lncfg.DefaultSweeperConfig(),
 		Htlcswitch: &lncfg.Htlcswitch{
 			MailboxDeliveryTimeout: htlcswitch.DefaultMailboxDeliveryTimeout,
 		},