Summary:
Ref T4809. Buildables currently have buildStatus and buildableStatus. Neither are used, and no one knows why we have two.
I'm going to use buildableStatus shortly, but buildStatus is meaningless; burn it.
Test Plan: `grep`, examined similar get/set calls, created a new buildable, ran storage upgrade.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4809
Differential Revision: https://secure.phabricator.com/D8796
