Upgrade to use stable `package:googleapis/v1.dart` of datastore

test/db_all_e2e_test.dart

 // Copyright (c) 2014, 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.
 
 library gcloud.test.db_all_test;
 
 import 'dart:io';
 import 'dart:async';
 
 import 'package:gcloud/db.dart' as db;
 import 'package:gcloud/src/datastore_impl.dart' as datastore_impl;
 import 'package:unittest/unittest.dart';
 
 import 'db/e2e/db_test_impl.dart' as db_test;
 import 'db/e2e/metamodel_test_impl.dart' as db_metamodel_test;
 import 'datastore/e2e/datastore_test_impl.dart' as datastore_test;
 
 
 import 'common_e2e.dart';
 
 main() {
   var scopes = datastore_impl.DatastoreImpl.SCOPES;
 
   var now = new DateTime.now().millisecondsSinceEpoch;
   String namespace = '${Platform.operatingSystem}${now}';
 
   withAuthClient(scopes, (String project, httpClient) {
-    var datastore = new datastore_impl.DatastoreImpl(httpClient, 's~$project');
+    var datastore = new datastore_impl.DatastoreImpl(httpClient, project);
     var datastoreDB = new db.DatastoreDB(datastore);
 
     return runE2EUnittest(() {
       datastore_test.runTests(datastore, namespace);
 
       test('sleep-between-test-suites', () {
         expect(new Future.delayed(const Duration(seconds: 10)), completes);
       });
 
       db_test.runTests(datastoreDB, namespace);
 
       test('sleep-between-test-suites', () {
         expect(new Future.delayed(const Duration(seconds: 10)), completes);
       });
 
       db_metamodel_test.runTests(datastore, datastoreDB);
     }).whenComplete(() {
       return datastore_test.cleanupDB(datastore, namespace);
     });
   });
 }