Creating google-cloud-pubsub==0.30.0 release. (#4619)

Also:

- Making a release of the umbrella package (since `google-cloud-pubsub` has
  transition from `0.29.x` to `0.30.x`)
- Updating version with `.dev1` suffix in `bigquery_datatransfer`,
  `container` and `trace` packages
- Adding `google-cloud-bigquery-datatransfer` and `google-cloud-container`
  to umbrella package

packages/google-cloud-container/setup.py

@@ -35,7 +35,7 @@
 
 setup(
     name='google-cloud-container',
-    version='0.1.0',
+    version='0.1.1.dev1',
     author='Google Inc',
     author_email='googleapis-packages@google.com',
     classifiers=[