Switch pkg packages, pub, and dartdoc to use package: imports.

pkg/scheduled_test/test/scheduled_server_test.dart

Index: pkg/scheduled_test/test/scheduled_server_test.dart
diff --git a/pkg/scheduled_test/test/scheduled_server_test.dart b/pkg/scheduled_test/test/scheduled_server_test.dart
index aeb654f9a7e34503587aaf23b51e3f0db8100b52..19135e0c834b88c2f4a3086cc2656c5b41a3fedb 100644
--- a/pkg/scheduled_test/test/scheduled_server_test.dart
+++ b/pkg/scheduled_test/test/scheduled_server_test.dart
@@ -7,10 +7,10 @@ library scheduled_server_test;
 import 'dart:async';
 import 'dart:io';
 
-import '../../../pkg/http/lib/http.dart' as http;
-import '../lib/scheduled_server.dart';
-import '../lib/scheduled_test.dart';
-import '../lib/src/mock_clock.dart' as mock_clock;
+import 'package:http/http.dart' as http;
+import 'package:scheduled_test/scheduled_server.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+import 'package:scheduled_test/src/mock_clock.dart' as mock_clock;
 
 import 'metatest.dart';
 import 'utils.dart';