Add a line to pub usage output explaining how to see global options.

sdk/lib/_internal/pub/test/pub_uploader_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library pub_uploader_test;
 
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:scheduled_test/scheduled_process.dart';
@@ skipping 11 matching lines @@
 Manage uploaders for a package on pub.dartlang.org.
 
 Usage: pub uploader [options] {add/remove} <email>
 -h, --help       Print usage information for this command.
     --server     The package server on which the package is hosted.
                  (defaults to "https://pub.dartlang.org")
 
     --package    The package whose uploaders will be modified.
                  (defaults to the current package)
 
+Run "pub help" to see global options.
 See http://dartlang.org/tools/pub/cmd/pub-uploader.html for detailed documentation.
 ''';
 
 ScheduledProcess startPubUploader(ScheduledServer server, List<String> args) {
   var tokenEndpoint = server.url.then((url) =>
       url.resolve('/token').toString());
   args = flatten(['uploader', '--server', tokenEndpoint, args]);
   return startPub(args: args, tokenEndpoint: tokenEndpoint);
 }
 
@@ skipping 120 matching lines @@
 
     server.handle('DELETE', '/api/packages/pkg/uploaders/email',
         (request) => new shelf.Response.ok("{not json"));
 
     pub.stderr.expect(emitsLines(
         'Invalid server response:\n'
         '{not json'));
     pub.shouldExit(1);
   });
 }