Update versions for mega-release.
Update versions for mega-release.

We want to update

- `google-cloud-bigquery`
- `google-cloud-datastore`
- `google-cloud-logging`
- `google-cloud-storage`
- `google-cloud-core`

And then update `google-cloud` to re-wrap the latest
versions of each.

However, to avoid having packages in `google-cloud` with
conflicting versions of `google-cloud-core`, we must
release all packages.

googleapis/python-runtimeconfig,googleapis/python-runtimeconfig