go/neo/proto: Sync message type codes with NEO/py

Don't skip a code when going request1->request2 through `Request1
Answer1 Request2`. For example before this patch:

	1		RequestIdentification
	1 | answerBit	AcceptIdentification
	3		Ping
	3 | answerBit	Pong
	...

after this patch:

	1		RequestIdentification
	1 | answerBit	AcceptIdentification
	2		Ping
	2 | answerBit	Pong
	...

This corresponds to NEO/py commit a00ab78b ("protocol: small cleanup in
packet registration").

go/neo/proto/protogen.go

@@ -341,14 +341,12 @@ import (
 			// generate code for this type to implement neo.Msg
 			var msgCode MsgCode
 			msgCode.answer = specAnnotation.answer || strings.HasPrefix(typename, "Answer")
-			switch {
-			case !msgCode.answer || typename == "Error":
-				msgCode.msgSerial = msgSerial
-
-			// answer to something
-			default:
-				msgCode.msgSerial = msgSerial - 1
+			// increment msgSerial only by +1 when going from
+			// request1->request2 in `Request1 Answer1 Request2`.
+			if msgCode.answer && typename != "Error" {
+				msgSerial--
 			}
+			msgCode.msgSerial = msgSerial
 
 			fmt.Fprintf(&buf, "// %s. %s\n\n", msgCode, typename)
 

go/neo/proto/ztestdata_proto_py_test.go

@@ -3,102 +3,102 @@ package proto
 
 var pyMsgRegistry = map[uint16]string{
 	1:	"RequestIdentification",
-	3:	"Ping",
-	5:	"CloseClient",
-	6:	"PrimaryMaster",
-	8:	"NotPrimaryMaster",
-	9:	"NotifyNodeInformation",
-	10:	"Recovery",
-	12:	"LastIDs",
-	14:	"AskPartitionTable",
-	16:	"SendPartitionTable",
-	17:	"NotifyPartitionChanges",
-	18:	"StartOperation",
-	19:	"StopOperation",
-	20:	"UnfinishedTransactions",
-	22:	"LockedTransactions",
-	24:	"FinalTID",
-	26:	"ValidateTransaction",
-	27:	"BeginTransaction",
-	29:	"FailedVote",
-	30:	"FinishTransaction",
-	32:	"LockInformation",
-	34:	"InvalidateObjects",
-	35:	"NotifyUnlockInformation",
-	36:	"AskNewOIDs",
-	38:	"NotifyDeadlock",
-	39:	"RebaseTransaction",
-	41:	"RebaseObject",
-	43:	"StoreObject",
-	45:	"AbortTransaction",
-	46:	"StoreTransaction",
-	48:	"VoteTransaction",
-	50:	"GetObject",
-	52:	"AskTIDs",
-	54:	"TransactionInformation",
-	56:	"ObjectHistory",
-	58:	"PartitionList",
-	60:	"NodeList",
-	62:	"SetNodeState",
-	63:	"AddPendingNodes",
-	64:	"TweakPartitionTable",
-	65:	"SetClusterState",
-	66:	"Repair",
-	67:	"RepairOne",
-	68:	"NotifyClusterState",
-	69:	"AskClusterState",
-	71:	"ObjectUndoSerial",
-	73:	"AskTIDsFrom",
-	75:	"Pack",
-	77:	"CheckReplicas",
-	78:	"CheckPartition",
-	79:	"CheckTIDRange",
-	81:	"CheckSerialRange",
-	83:	"PartitionCorrupted",
-	84:	"NotifyReady",
-	85:	"LastTransaction",
-	87:	"CheckCurrentSerial",
-	89:	"NotifyTransactionFinished",
-	90:	"Replicate",
-	91:	"ReplicationDone",
-	92:	"FetchTransactions",
-	94:	"FetchObjects",
-	96:	"AddTransaction",
-	97:	"AddObject",
-	98:	"Truncate",
+	2:	"Ping",
+	3:	"CloseClient",
+	4:	"PrimaryMaster",
+	5:	"NotPrimaryMaster",
+	6:	"NotifyNodeInformation",
+	7:	"Recovery",
+	8:	"LastIDs",
+	9:	"AskPartitionTable",
+	10:	"SendPartitionTable",
+	11:	"NotifyPartitionChanges",
+	12:	"StartOperation",
+	13:	"StopOperation",
+	14:	"UnfinishedTransactions",
+	15:	"LockedTransactions",
+	16:	"FinalTID",
+	17:	"ValidateTransaction",
+	18:	"BeginTransaction",
+	19:	"FailedVote",
+	20:	"FinishTransaction",
+	21:	"LockInformation",
+	22:	"InvalidateObjects",
+	23:	"NotifyUnlockInformation",
+	24:	"AskNewOIDs",
+	25:	"NotifyDeadlock",
+	26:	"RebaseTransaction",
+	27:	"RebaseObject",
+	28:	"StoreObject",
+	29:	"AbortTransaction",
+	30:	"StoreTransaction",
+	31:	"VoteTransaction",
+	32:	"GetObject",
+	33:	"AskTIDs",
+	34:	"TransactionInformation",
+	35:	"ObjectHistory",
+	36:	"PartitionList",
+	37:	"NodeList",
+	38:	"SetNodeState",
+	39:	"AddPendingNodes",
+	40:	"TweakPartitionTable",
+	41:	"SetClusterState",
+	42:	"Repair",
+	43:	"RepairOne",
+	44:	"NotifyClusterState",
+	45:	"AskClusterState",
+	46:	"ObjectUndoSerial",
+	47:	"AskTIDsFrom",
+	48:	"Pack",
+	49:	"CheckReplicas",
+	50:	"CheckPartition",
+	51:	"CheckTIDRange",
+	52:	"CheckSerialRange",
+	53:	"PartitionCorrupted",
+	54:	"NotifyReady",
+	55:	"LastTransaction",
+	56:	"CheckCurrentSerial",
+	57:	"NotifyTransactionFinished",
+	58:	"Replicate",
+	59:	"ReplicationDone",
+	60:	"FetchTransactions",
+	61:	"FetchObjects",
+	62:	"AddTransaction",
+	63:	"AddObject",
+	64:	"Truncate",
 	32768:	"Error",
 	32769:	"AcceptIdentification",
-	32771:	"Pong",
-	32774:	"AnswerPrimary",
-	32778:	"AnswerRecovery",
-	32780:	"AnswerLastIDs",
-	32782:	"AnswerPartitionTable",
-	32788:	"AnswerUnfinishedTransactions",
-	32790:	"AnswerLockedTransactions",
-	32792:	"AnswerFinalTID",
-	32795:	"AnswerBeginTransaction",
-	32798:	"AnswerTransactionFinished",
-	32800:	"AnswerInformationLocked",
-	32804:	"AnswerNewOIDs",
-	32807:	"AnswerRebaseTransaction",
-	32809:	"AnswerRebaseObject",
-	32811:	"AnswerStoreObject",
-	32814:	"AnswerStoreTransaction",
-	32816:	"AnswerVoteTransaction",
-	32818:	"AnswerObject",
-	32820:	"AnswerTIDs",
-	32822:	"AnswerTransactionInformation",
-	32824:	"AnswerObjectHistory",
-	32826:	"AnswerPartitionList",
-	32828:	"AnswerNodeList",
-	32837:	"AnswerClusterState",
-	32839:	"AnswerObjectUndoSerial",
-	32841:	"AnswerTIDsFrom",
-	32843:	"AnswerPack",
-	32847:	"AnswerCheckTIDRange",
-	32849:	"AnswerCheckSerialRange",
-	32853:	"AnswerLastTransaction",
-	32855:	"AnswerCheckCurrentSerial",
-	32860:	"AnswerFetchTransactions",
-	32862:	"AnswerFetchObjects",
+	32770:	"Pong",
+	32772:	"AnswerPrimary",
+	32775:	"AnswerRecovery",
+	32776:	"AnswerLastIDs",
+	32777:	"AnswerPartitionTable",
+	32782:	"AnswerUnfinishedTransactions",
+	32783:	"AnswerLockedTransactions",
+	32784:	"AnswerFinalTID",
+	32786:	"AnswerBeginTransaction",
+	32788:	"AnswerTransactionFinished",
+	32789:	"AnswerInformationLocked",
+	32792:	"AnswerNewOIDs",
+	32794:	"AnswerRebaseTransaction",
+	32795:	"AnswerRebaseObject",
+	32796:	"AnswerStoreObject",
+	32798:	"AnswerStoreTransaction",
+	32799:	"AnswerVoteTransaction",
+	32800:	"AnswerObject",
+	32801:	"AnswerTIDs",
+	32802:	"AnswerTransactionInformation",
+	32803:	"AnswerObjectHistory",
+	32804:	"AnswerPartitionList",
+	32805:	"AnswerNodeList",
+	32813:	"AnswerClusterState",
+	32814:	"AnswerObjectUndoSerial",
+	32815:	"AnswerTIDsFrom",
+	32816:	"AnswerPack",
+	32819:	"AnswerCheckTIDRange",
+	32820:	"AnswerCheckSerialRange",
+	32823:	"AnswerLastTransaction",
+	32824:	"AnswerCheckCurrentSerial",
+	32828:	"AnswerFetchTransactions",
+	32829:	"AnswerFetchObjects",
 }