utxonursery: store the chanPoint of the source channel in kidOutput

This commit adds an additional field to the kidOutput struct: the
outpoint of the channel that originally created the output. This field
is now needed in order to add some additional indexes that are required
to enable callers to query the internal state of the utxoNursery.

utxonursery_test.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"bytes"
-	"fmt"
 	"reflect"
 	"testing"
 
@@ -166,23 +165,29 @@ var (
 
 	kidOutputs = []kidOutput{
 		{
+			originChanPoint:  outPoints[1],
 			amt:              btcutil.Amount(13e7),
 			outPoint:         outPoints[0],
 			blocksToMaturity: uint32(100),
+			witnessType:      commitmentTimeLock,
 			confHeight:       uint32(1770001),
 		},
 
 		{
+			originChanPoint:  outPoints[0],
 			amt:              btcutil.Amount(24e7),
 			outPoint:         outPoints[1],
 			blocksToMaturity: uint32(50),
+			witnessType:      commitmentTimeLock,
 			confHeight:       uint32(22342321),
 		},
 
 		{
+			originChanPoint:  outPoints[2],
 			amt:              btcutil.Amount(2e5),
 			outPoint:         outPoints[2],
 			blocksToMaturity: uint32(12),
+			witnessType:      commitmentTimeLock,
 			confHeight:       uint32(34241),
 		},
 	}
@@ -236,7 +241,7 @@ func TestSerializeKidOutput(t *testing.T) {
 
 	deserializedKid, err := deserializeKidOutput(&b)
 	if err != nil {
-		fmt.Printf(err.Error())
+		t.Fatalf(err.Error())
 	}
 
 	if !reflect.DeepEqual(kid, deserializedKid) {