Clean up imports in analysis_server and analyzer_cli (and one missed in analyzer)

pkg/analysis_server/test/services/index/local_index_test.dart

Index: pkg/analysis_server/test/services/index/local_index_test.dart
diff --git a/pkg/analysis_server/test/services/index/local_index_test.dart b/pkg/analysis_server/test/services/index/local_index_test.dart
index dc2e92aefacfe590f69f00eaae1c309b3b9e807a..5f318ad3c0a518de10d77503423b6843a5a69980 100644
--- a/pkg/analysis_server/test/services/index/local_index_test.dart
+++ b/pkg/analysis_server/test/services/index/local_index_test.dart
@@ -7,8 +7,8 @@ library test.services.src.index.local_index;
 import 'package:analysis_server/src/services/index/index_contributor.dart';
 import 'package:analysis_server/src/services/index/local_index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
+import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';