Clean up package imports and library names

pkg/analyzer/test/src/plugin/plugin_config_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.
 
-library test.src.plugin.plugin_config_test;
+library analyzer.test.src.plugin.plugin_config_test;
 
 import 'package:analyzer/source/analysis_options_provider.dart';
 import 'package:analyzer/src/plugin/plugin_configuration.dart';
 import 'package:unittest/unittest.dart';
 import 'package:yaml/yaml.dart';
 
 main() {
   group('plugin config tests', () {
     group('parsing', () {
       test('plugin map', () {
@@ skipping 102 matching lines @@
   });
 }
 
 PluginConfig parseConfig(String optionsSrc) {
   var options = new AnalysisOptionsProvider().getOptionsFromString(optionsSrc);
   return new PluginConfig.fromOptions(options);
 }
 
 List<PluginInfo> pluginsSortedByName(Iterable<PluginInfo> plugins) =>
     plugins.toList()..sort((p1, p2) => p1.name.compareTo(p2.name));