Move the linter core to the analyzer package

pkg/analysis_server/test/context_manager_test.dart

Index: pkg/analysis_server/test/context_manager_test.dart
diff --git a/pkg/analysis_server/test/context_manager_test.dart b/pkg/analysis_server/test/context_manager_test.dart
index 46a2d44dd3a70f4f6c09f361b0936fe26a27746d..a10da9b7a487539ec9f20d46e314e56de34fb1e3 100644
--- a/pkg/analysis_server/test/context_manager_test.dart
+++ b/pkg/analysis_server/test/context_manager_test.dart
@@ -22,6 +22,7 @@ import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/services/lint.dart';
 import 'package:analyzer/src/util/glob.dart';
 import 'package:linter/src/plugin/linter_plugin.dart';
+import 'package:linter/src/rules.dart';
 import 'package:linter/src/rules/avoid_as.dart';
 import 'package:path/path.dart' as path;
 import 'package:plugin/manager.dart';
@@ -1782,6 +1783,8 @@ abstract class ContextManagerTest {
     plugins.add(linterPlugin);
     ExtensionManager manager = new ExtensionManager();
     manager.processPlugins(plugins);
+
+    registerLintRules();
   }
 
   UriResolver providePackageResolver(Folder folder) => packageResolver;