Flip .packages server support bit.

pkg/analysis_server/test/server_options_test.dart

 // Copyright (c) 2015, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library analysis_server.test.server_options;
 
 import 'package:analysis_server/src/server_options.dart';
@@ skipping 15 matching lines @@
       var options = new ServerOptions.fromContents('''foo: true
 bar: TRUE
 baz: false
 foobar: off
 ''');
       expect(options.isSet('foo'), isTrue);
       expect(options.isSet('bar'), isTrue);
       expect(options.isSet('baz'), isFalse);
       expect(options.isSet('foobar'), isFalse);
       expect(options.isSet('does_not_exist'), isFalse);
+      expect(options.isSet('does_not_exist', defaultValue: true), isTrue);
     });
 
     test('basic - getStringValue', () {
       var options = new ServerOptions.fromContents('''foo: someValue
 ''');
       expect(options.getStringValue('foo'), equals('someValue'));
       expect(options.getStringValue('not_there'), isNull);
       expect(options.getStringValue('not_there', defaultValue: 'bar'),
           equals('bar'));
     });
   });
 }