Release 20170525 of the `datalab` command line tool.

[ojarjur]

This is a tracking issue for the 20170525 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 453a11f
A tarball of the CLI tool release can be downloaded by running:

gsutil cp gs://cloud-datalab/datalab-cli-20170525.tgz ./

The following changes are included in this release:

Bug Fixes:

#1368 : Don't attempt to reconnect if the instance is no longer RUNNING.
#1372 : Fix bug in the list command that filtered new instances.

Internal Cleanups:

#1380 : Switch to the GA version of the gcloud source repos commands.

[ojarjur]

This has now landed in the 157.0.0 release of the Cloud SDK