Release 20180823 of the `datalab` command line tool.

[ojarjur]

This is a tracking issue for the 20180823 release of the datalab command line tool.

This issue will be used to report the source of the tool, it's changes, and when it is incorporated into the Google Cloud SDK

Source

The commit of the release is 9b93098
A tarball of the CLI tool release can be downloaded by running:

gsutil cp gs://cloud-datalab/builds/datalab-cli-9b930986236944986c1657163b8f428bd66d3407.tgz ./

The following changes are included in this release:

Bug Fixes:

#2067 Ensure that home directories have the right owner at startup.

[ojarjur]

This has gone out with the 215.0.0 release of the Cloud SDK