Release 20171222 of the datalab command line tool.

[ojarjur]

This is a tracking issue for the 20171222 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 6e91ea2
A tarball of the CLI tool release can be downloaded by running:

gsutil cp gs://cloud-datalab/builds/datalab-cli-6e91ea2e4cc4dc0a4deb0223f14da92cccb34e69.tgz ./
The following changes are included in this release:

New Features:
#1755, #1759, and #1780: Add a message after closing the connection to a Datalab instance telling how to reconnect to that same instance.
#1838: Add support for private custom images in GCR repos.
#1852: Add a --no-swap flag to the datalab create command to allow disabling swap

Fixes:
#1837: Fix a warning that would be displayed when running datalab list with the --zones flag.
#1850: Don't create a swap file if there is not enough space on the instance's persistent disk for it.
#1863: Replace a misleading confirmation prompt from gcloud with one tailored to Datalab.

Cleanups:
#1858: Prompt for a zone (if necessary) right away rather than waiting for the network and repository setup to finish.
#1861: Make the default verbosity of the datalab create command more appropriate for first-time users.

[ojarjur]

Note that this release will not go out until after the new year.

[ojarjur]

I tried to see if we could roll the GPU instance OS changes into the same release, but that didn't land in time and so will be in a subsequent release.

[ojarjur]

This is now included in the 184.0.0 release of the Cloud SDK