lnwire: add FundingLocked message

When the funding transaction has been confirmed, the FundingLocked
message is sent by the peers to each other so that the existence of the
newly funded channel can be announced to the network.

This commit also removes the SingleFundingOpenProof message.

lnwire/message.go

@@ -30,7 +30,9 @@ const (
 	CmdSingleFundingResponse     = uint32(110)
 	CmdSingleFundingComplete     = uint32(120)
 	CmdSingleFundingSignComplete = uint32(130)
-	CmdSingleFundingOpenProof    = uint32(140)
+
+	// Command for locking a funded channel
+	CmdFundingLocked = uint32(200)
 
 	// Commands for the workflow of cooperatively closing an active channel.
 	CmdCloseRequest  = uint32(300)
@@ -99,8 +101,8 @@ func makeEmptyMessage(command uint32) (Message, error) {
 		msg = &SingleFundingComplete{}
 	case CmdSingleFundingSignComplete:
 		msg = &SingleFundingSignComplete{}
-	case CmdSingleFundingOpenProof:
-		msg = &SingleFundingOpenProof{}
+	case CmdFundingLocked:
+		msg = &FundingLocked{}
 	case CmdCloseRequest:
 		msg = &CloseRequest{}
 	case CmdCloseComplete: