add load general model service

sdk-cpp/proto/load_general_model_service.proto

+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+import "pds_option.proto";
+package baidu.paddle_serving.predictor.load_general_model_service;
+
+option cc_generic_services = true;
+
+message RequestAndResponse {
+  required int32 a = 1;
+  required float b = 2;
+};
+
+service LoadGeneralModelService {
+  rpc inference(RequestAndResponse) returns (RequestAndResponse);
+  rpc debug(RequestAndResponse) returns (RequestAndResponse);
+  option (pds.options).generate_stub = true;
+};