Remove gogoproto from Makefile's TOOLS (#2198)

* remove gogoproto from tools

because it's not a binary

* update protobuf version to 3.6.1 in `make get_protoc`

* update libs/common/types.pb.go and rpc/grpc/types.pb.go

* fix app tests

abci/example/kvstore/kvstore.go

@@ -81,8 +81,8 @@ func (app *KVStoreApplication) DeliverTx(tx []byte) types.ResponseDeliverTx {
 	app.state.Size += 1
 
 	tags := []cmn.KVPair{
-		{[]byte("app.creator"), []byte("jae")},
-		{[]byte("app.key"), key},
+		{Key: []byte("app.creator"), Value: []byte("jae")},
+		{Key: []byte("app.key"), Value: key},
 	}
 	return types.ResponseDeliverTx{Code: code.CodeTypeOK, Tags: tags}
 }

abci/types/messages_test.go

@@ -22,7 +22,7 @@ func TestMarshalJSON(t *testing.T) {
 		Data:      []byte("hello"),
 		GasWanted: 43,
 		Tags: []cmn.KVPair{
-			{[]byte("pho"), []byte("bo")},
+			{Key: []byte("pho"), Value: []byte("bo")},
 		},
 	}
 	b, err = json.Marshal(&r1)
@@ -83,7 +83,7 @@ func TestWriteReadMessage2(t *testing.T) {
 			Log:       phrase,
 			GasWanted: 10,
 			Tags: []cmn.KVPair{
-				cmn.KVPair{[]byte("abc"), []byte("def")},
+				cmn.KVPair{Key: []byte("abc"), Value: []byte("def")},
 			},
 		},
 		// TODO: add the rest

abci/types/types.pb.go

@@ -16,8 +16,10 @@ import time "time"
 
 import bytes "bytes"
 
-import context "golang.org/x/net/context"
-import grpc "google.golang.org/grpc"
+import (
+	context "golang.org/x/net/context"
+	grpc "google.golang.org/grpc"
+)
 
 import github_com_gogo_protobuf_types "github.com/gogo/protobuf/types"
 
@@ -4998,8 +5000,9 @@ var _ grpc.ClientConn
 // is compatible with the grpc package it is being compiled against.
 const _ = grpc.SupportPackageIsVersion4
 
-// Client API for ABCIApplication service
-
+// ABCIApplicationClient is the client API for ABCIApplication service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
 type ABCIApplicationClient interface {
 	Echo(ctx context.Context, in *RequestEcho, opts ...grpc.CallOption) (*ResponseEcho, error)
 	Flush(ctx context.Context, in *RequestFlush, opts ...grpc.CallOption) (*ResponseFlush, error)