Update bulidbucket client

client/cmd/buildbucket/main.go

-// Copyright 2016 The LUCI Authors. All rights reserved.
-// Use of this source code is governed under the Apache License, Version 2.0
-// that can be found in the LICENSE file.
-
-package main
-
-import (
-        "os"
-
-        "github.com/maruel/subcommands"
-        "golang.org/x/net/context"
-
-        "github.com/luci/luci-go/common/cli"
-        "github.com/luci/luci-go/common/logging/gologger"
-)
-
-var logCfg = gologger.LoggerConfig{
-        Format: `%{message}`,
-        Out:    os.Stderr,
-}
-
-var application = &cli.Application{
-        Name:  "buildbucket",
-        Title: "A cli client for buildbucket.",
-        Context: func(ctx context.Context) context.Context {
-                return logCfg.Use(ctx)
-        },
-        Commands: []*subcommands.Command{
-                cmdPutBatch,
-                cmdGet,
-                cmdCancel,
-                subcommands.CmdHelp,
-        },
-}
-
-func main() {
-        os.Exit(subcommands.Run(application, os.Args[1:]))
-}