Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/github.com/googleapis/gnostic/apps/petstore-builder/main.go

@@ -0,0 +1,82 @@
+// Copyright 2017 Google Inc. 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.
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path"
+
+	"github.com/golang/protobuf/proto"
+)
+
+func usage() string {
+	return fmt.Sprintf(`
+Usage: %s [OPTIONS]
+Options:
+  --v2
+    Generate an OpenAPI v2 description.
+  --v3
+    Generate an OpenAPI v3 description.
+`, path.Base(os.Args[0]))
+}
+
+func main() {
+	openAPIv2 := false
+	openAPIv3 := false
+
+	for i, arg := range os.Args {
+		if i == 0 {
+			continue // skip the tool name
+		}
+		if arg == "--v2" {
+			openAPIv2 = true
+		} else if arg == "--v3" {
+			openAPIv3 = true
+		} else {
+			fmt.Printf("Unknown option: %s.\n%s\n", arg, usage())
+			os.Exit(-1)
+		}
+	}
+
+	if !openAPIv2 && !openAPIv3 {
+		openAPIv2 = true
+	}
+
+	if openAPIv2 {
+		document := buildDocumentV2()
+		bytes, err := proto.Marshal(document)
+		if err != nil {
+			panic(err)
+		}
+		err = ioutil.WriteFile("petstore-v2.pb", bytes, 0644)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	if openAPIv3 {
+		document := buildDocumentV3()
+		bytes, err := proto.Marshal(document)
+		if err != nil {
+			panic(err)
+		}
+		err = ioutil.WriteFile("petstore-v3.pb", bytes, 0644)
+		if err != nil {
+			panic(err)
+		}
+	}
+}