Add a package to open source

Add {java,tests}/google/registry/export/datastore to open source.
This is part of the migration to Datastore Managed Import/Export
for backup.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=221800709

java/google/registry/export/datastore/DatastoreAdminModule.java

@@ -0,0 +1,39 @@
+// Copyright 2018 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.export.datastore;
+
+import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
+import dagger.Module;
+import dagger.Provides;
+import google.registry.config.CredentialModule;
+import google.registry.config.RegistryConfig;
+import javax.inject.Singleton;
+
+/** Dagger module that configures provision of {@link DatastoreAdmin}. */
+@Module
+public abstract class DatastoreAdminModule {
+
+  @Singleton
+  @Provides
+  static DatastoreAdmin provideDatastoreAdmin(
+      @CredentialModule.DefaultCredential GoogleCredential credential,
+      @RegistryConfig.Config("projectId") String projectId) {
+    return new DatastoreAdmin.Builder(
+            credential.getTransport(), credential.getJsonFactory(), credential)
+        .setApplicationName(projectId)
+        .setProjectId(projectId)
+        .build();
+  }
+}