multi: unify default sweep/htlc conf targets

Create a HtlcConfTarget which is used as a default for quote
and loop in. Update loop out quote to use the existing var
rather than just 6 inline.

cmd/loop/quote.go

@@ -88,7 +88,7 @@ var quoteOutCommand = cli.Command{
 			Usage: "the number of blocks from the swap " +
 				"initiation height that the on-chain HTLC " +
 				"should be swept within in a Loop Out",
-			Value: 6,
+			Value: uint64(loop.DefaultSweepConfTarget),
 		},
 		cli.BoolFlag{
 			Name: "fast",

loopd/start.go

@@ -14,10 +14,7 @@ import (
 	"github.com/lightningnetwork/lnd/build"
 )
 
-const (
-	defaultConfTarget     = int32(6)
-	defaultConfigFilename = "loopd.conf"
-)
+const defaultConfigFilename = "loopd.conf"
 
 // RPCConfig holds optional options that can be used to make the loop daemon
 // communicate on custom connections.

loopd/swapclient_server.go

@@ -363,7 +363,7 @@ func (s *swapClientServer) GetLoopInQuote(ctx context.Context,
 
 	quote, err := s.impl.LoopInQuote(ctx, &loop.LoopInQuoteRequest{
 		Amount:         btcutil.Amount(req.Amt),
-		HtlcConfTarget: defaultConfTarget,
+		HtlcConfTarget: loop.DefaultHtlcConfTarget,
 		ExternalHtlc:   req.ExternalHtlc,
 	})
 	if err != nil {
@@ -385,7 +385,7 @@ func (s *swapClientServer) LoopIn(ctx context.Context,
 		Amount:         btcutil.Amount(in.Amt),
 		MaxMinerFee:    btcutil.Amount(in.MaxMinerFee),
 		MaxSwapFee:     btcutil.Amount(in.MaxSwapFee),
-		HtlcConfTarget: defaultConfTarget,
+		HtlcConfTarget: loop.DefaultHtlcConfTarget,
 		ExternalHtlc:   in.ExternalHtlc,
 	}
 	if in.LastHop != nil {

loopout.go

@@ -26,6 +26,10 @@ var (
 	// when sweeping on-chain HTLCs.
 	DefaultSweepConfTarget int32 = 6
 
+	// DefaultHtlcConfTarget is the default confirmation target we'll use
+	// for on-chain htlcs published by the swap client for Loop In.
+	DefaultHtlcConfTarget int32 = 6
+
 	// DefaultSweepConfTargetDelta is the delta of blocks from a Loop Out
 	// swap's expiration height at which we begin to use the default sweep
 	// confirmation target.