Add missing __init__ files. And also add some required testdata in MA…

…NIFEST.in

* Update MANIFEST.in

* Create __init__.py

MANIFEST.in

@@ -3,3 +3,6 @@ include tfx/orchestration/experimental/interactive/export_templates/*.tmpl
 include tfx/experimental/templates/taxi/.gitignore
 include tfx/experimental/templates/taxi/*.ipynb
 include tfx/orchestration/kubeflow/v2/artifact_types/*.yaml
+# TODO(b/172611374): Consider adding all testdata in the wheel to make test
+# fixture more portable.
+recursive-include tfx/orchestration/kubeflow/v2/testdata *

tfx/orchestration/kubeflow/v2/components/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2020 Google LLC. 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.