Summary:
Contains a set of recipes to provision our machines. There are primiarly three different roles that can be provisioned:

pl_base_dev -- Has everything to run builds.
pl_workstation -- Has the recipes to setup a full dev workstation.
pl_desktop -- Has all gui apps.

One thing left to debug is why our new images are bit bigger:

Original:
gcr.io/pl-dev-infra/base_dev_image          201811061534        36a879b7aa10        2 weeks ago         2.26GB

New:
gcr.io/pl-dev-infra/base_dev_image          201811270026        7ac725b2098b        10 hours ago        2.43GB

And the delta with the dev image (there should be no delta right now):
gcr.io/pl-dev-infra/dev_image               201811271012        5fa2b90382ed        25 minutes ago      2.85GB

Docs here: https://phab.corp.pixielabs.ai/w/eng/machine_provisioning/

Test Plan:
  Tested on Linux VM to ensure proper setup.
  Tested on Mac.
  Crated docker images using `make build_and_push_base_dev_image` and `make build_and_push_dev_images`

Reviewers: #engineering, michelle, philkuz

Reviewed By: philkuz

Subscribers: kgandhi, philkuz

Differential Revision: https://phab.corp.pixielabs.ai/D131

GitOrigin-RevId: 3ad87c10fe426c7a5f565c76370f89c0243ed164