Revert "Move `analyzer_cli` into the SDK."

pkg/analyzer_cli/test/all.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.
-
-import 'driver_test.dart' as driver;
-import 'error_test.dart' as error;
-import 'options_test.dart' as options;
-import 'plugin_manager_test.dart' as plugin_manager;
-import 'reporter_test.dart' as reporter;
-import 'sdk_ext_test.dart' as sdk_ext;
-import 'strong_mode_test.dart' as strong_mode;
-import 'super_mixin_test.dart' as super_mixin;
-
-main() {
-  driver.main();
-  error.main();
-  options.main();
-  plugin_manager.main();
-  reporter.main();
-  sdk_ext.main();
-  strong_mode.main();
-  super_mixin.main();
-}