Reorganize tests for samples so the test is discoverable from the sample

samples/swarm/test/swarm_ui_lib/util/util_test.dart

Index: samples/swarm/test/swarm_ui_lib/util/util_test.dart
diff --git a/samples/tests/samples/lib/util/util_test.dart b/samples/swarm/test/swarm_ui_lib/util/util_test.dart
similarity index 87%
rename from samples/tests/samples/lib/util/util_test.dart
rename to samples/swarm/test/swarm_ui_lib/util/util_test.dart
index c6fd0ef4110b16bbf7ecf8659f946a3dd0521cc2..97b589075a2030c23fd0f1061faef10bd50989e3 100644
--- a/samples/tests/samples/lib/util/util_test.dart
+++ b/samples/swarm/test/swarm_ui_lib/util/util_test.dart
@@ -5,9 +5,9 @@
 library util_tests;
 
 import 'dart:html';
-import '../../../../../pkg/unittest/lib/unittest.dart';
-import '../../../../../pkg/unittest/lib/html_config.dart';
-import '../../../../swarm/swarm_ui_lib/util/utilslib.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import '../../../swarm_ui_lib/util/utilslib.dart';
 
 main() {
   useHtmlConfiguration();