Add a `puppet-lint` linter.

Summary: This linter is a wrapper around [[http://puppet-lint.com/ | puppet-lint[]].

Test Plan: Wrote an executed unit tests.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D8990