lnwallet: update to adhere to new channeldb API change

This commit modifies the lnwallet code and related tests in order to
adhere to the recent field-name change to channeldb.OpenChannel.
Instead of having the field ‘TheirLNID’ which is the sha256 of the
node’s public key, we now instead use the public key directly in all
contexts.

lnwallet/wallet.go

@@ -92,8 +92,7 @@ type initFundingReserveMsg struct {
 	minFeeRate btcutil.Amount
 
 	// The ID of the remote node we would like to open a channel with.
-	// TODO(roasbeef): switch to just reg pubkey?
-	nodeID [32]byte
+	nodeID *btcec.PublicKey
 
 	// The delay on the "pay-to-self" output(s) of the commitment transaction.
 	csvDelay uint32
@@ -473,8 +472,8 @@ out:
 // transaction, and that the signature we records for our version of the
 // commitment transaction is valid.
 func (l *LightningWallet) InitChannelReservation(capacity,
-	ourFundAmt btcutil.Amount, theirID [32]byte, numConfs uint16,
-	csvDelay uint32) (*ChannelReservation, error) {
+	ourFundAmt btcutil.Amount, theirID *btcec.PublicKey,
+	numConfs uint16, csvDelay uint32) (*ChannelReservation, error) {
 
 	errChan := make(chan error, 1)
 	respChan := make(chan *ChannelReservation, 1)
@@ -512,7 +511,7 @@ func (l *LightningWallet) handleFundingReserveRequest(req *initFundingReserveMsg
 	reservation.Lock()
 	defer reservation.Unlock()
 
-	reservation.partialState.TheirLNID = req.nodeID
+	reservation.partialState.IdentityPub = req.nodeID
 	ourContribution := reservation.ourContribution
 	ourContribution.CsvDelay = req.csvDelay
 	reservation.partialState.LocalCsvDelay = req.csvDelay