lnwallet: rename DelayKey->ToLocalKey, NoDelayKey->ToRemoteKey

Since both parties are going to have their ouputs delayed, we move way
from the DelayKey naming, and instead use ToLocalKey and ToRemoteKey.

watchtower/wtclient/backup_task.go

@@ -189,7 +189,7 @@ func (t *backupTask) craftSessionPayload(
 	justiceKit := &blob.JusticeKit{
 		SweepAddress:     t.sweepPkScript,
 		RevocationPubKey: toBlobPubKey(keyRing.RevocationKey),
-		LocalDelayPubKey: toBlobPubKey(keyRing.DelayKey),
+		LocalDelayPubKey: toBlobPubKey(keyRing.ToLocalKey),
 		CSVDelay:         t.breachInfo.RemoteDelay,
 	}
 
@@ -199,7 +199,7 @@ func (t *backupTask) craftSessionPayload(
 	// output to spend from.
 	if t.toRemoteInput != nil {
 		justiceKit.CommitToRemotePubKey = toBlobPubKey(
-			keyRing.NoDelayKey,
+			keyRing.ToRemoteKey,
 		)
 	}
 

watchtower/wtclient/backup_task_internal_test.go

@@ -121,8 +121,8 @@ func genTaskTest(
 		BreachTransaction: breachTxn,
 		KeyRing: &lnwallet.CommitmentKeyRing{
 			RevocationKey: revPK,
-			DelayKey:      toLocalPK,
-			NoDelayKey:    toRemotePK,
+			ToLocalKey:    toLocalPK,
+			ToRemoteKey:   toRemotePK,
 		},
 		RemoteDelay: csvDelay,
 	}
@@ -565,9 +565,9 @@ func testBackupTask(t *testing.T, test backupTaskTest) {
 	}
 
 	keyRing := test.breachInfo.KeyRing
-	expToLocalPK := keyRing.DelayKey.SerializeCompressed()
+	expToLocalPK := keyRing.ToLocalKey.SerializeCompressed()
 	expRevPK := keyRing.RevocationKey.SerializeCompressed()
-	expToRemotePK := keyRing.NoDelayKey.SerializeCompressed()
+	expToRemotePK := keyRing.ToRemoteKey.SerializeCompressed()
 
 	// Assert that the blob contained the serialized revocation and to-local
 	// pubkeys.

watchtower/wtclient/client_test.go

@@ -291,8 +291,8 @@ func (c *mockChannel) createRemoteCommitTx(t *testing.T) {
 
 	commitKeyRing := &lnwallet.CommitmentKeyRing{
 		RevocationKey: c.revPK,
-		NoDelayKey:    c.toLocalPK,
-		DelayKey:      c.toRemotePK,
+		ToRemoteKey:   c.toLocalPK,
+		ToLocalKey:    c.toRemotePK,
 	}
 
 	retribution := &lnwallet.BreachRetribution{