invoicesrpc: format invoices.proto and remove json_name fields

We now use the jsonpb marshaler to convert the RPC responses to
JSON in lncli and REST. The jsonpb has a setting to use the
original name as defined in the proto file and the explicit
json_name definition is not necessary any more.
The jsonpb setting is called OrigName and needs to be true.

lnrpc/invoicesrpc/invoices.pb.go

@@ -113,22 +113,22 @@ type AddHoldInvoiceRequest struct {
 	//The value of this invoice in millisatoshis
 	//
 	//The fields value and value_msat are mutually exclusive.
-	ValueMsat int64 `protobuf:"varint,10,opt,name=value_msat,proto3" json:"value_msat,omitempty"`
+	ValueMsat int64 `protobuf:"varint,10,opt,name=value_msat,json=valueMsat,proto3" json:"value_msat,omitempty"`
 	//*
 	//Hash (SHA-256) of a description of the payment. Used if the description of
 	//payment (memo) is too long to naturally fit within the description field
 	//of an encoded payment request.
-	DescriptionHash []byte `protobuf:"bytes,4,opt,name=description_hash,proto3" json:"description_hash,omitempty"`
+	DescriptionHash []byte `protobuf:"bytes,4,opt,name=description_hash,json=descriptionHash,proto3" json:"description_hash,omitempty"`
 	/// Payment request expiry time in seconds. Default is 3600 (1 hour).
 	Expiry int64 `protobuf:"varint,5,opt,name=expiry,proto3" json:"expiry,omitempty"`
 	/// Fallback on-chain address.
-	FallbackAddr string `protobuf:"bytes,6,opt,name=fallback_addr,proto3" json:"fallback_addr,omitempty"`
+	FallbackAddr string `protobuf:"bytes,6,opt,name=fallback_addr,json=fallbackAddr,proto3" json:"fallback_addr,omitempty"`
 	/// Delta to use for the time-lock of the CLTV extended to the final hop.
-	CltvExpiry uint64 `protobuf:"varint,7,opt,name=cltv_expiry,proto3" json:"cltv_expiry,omitempty"`
+	CltvExpiry uint64 `protobuf:"varint,7,opt,name=cltv_expiry,json=cltvExpiry,proto3" json:"cltv_expiry,omitempty"`
 	//*
 	//Route hints that can each be individually used to assist in reaching the
 	//invoice's destination.
-	RouteHints []*lnrpc.RouteHint `protobuf:"bytes,8,rep,name=route_hints,proto3" json:"route_hints,omitempty"`
+	RouteHints []*lnrpc.RouteHint `protobuf:"bytes,8,rep,name=route_hints,json=routeHints,proto3" json:"route_hints,omitempty"`
 	/// Whether this invoice should include routing hints for private channels.
 	Private              bool     `protobuf:"varint,9,opt,name=private,proto3" json:"private,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
@@ -236,7 +236,7 @@ type AddHoldInvoiceResp struct {
 	//A bare-bones invoice for a payment within the Lightning Network.  With the
 	//details of the invoice, the sender has all the data necessary to send a
 	//payment to the recipient.
-	PaymentRequest       string   `protobuf:"bytes,1,opt,name=payment_request,proto3" json:"payment_request,omitempty"`
+	PaymentRequest       string   `protobuf:"bytes,1,opt,name=payment_request,json=paymentRequest,proto3" json:"payment_request,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -347,7 +347,7 @@ var xxx_messageInfo_SettleInvoiceResp proto.InternalMessageInfo
 
 type SubscribeSingleInvoiceRequest struct {
 	/// Hash corresponding to the (hold) invoice to subscribe to.
-	RHash                []byte   `protobuf:"bytes,2,opt,name=r_hash,proto3" json:"r_hash,omitempty"`
+	RHash                []byte   `protobuf:"bytes,2,opt,name=r_hash,json=rHash,proto3" json:"r_hash,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -398,40 +398,41 @@ func init() {
 func init() { proto.RegisterFile("invoicesrpc/invoices.proto", fileDescriptor_090ab9c4958b987d) }
 
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.