Scheduler/liberty

Goal
The primary goal is to clean up the scheduler interfaces so that access to the Nova scheduler is clearly defined and isolated. To accomplish this goal there are a set of tasks (blueprints & specs detailed in the table below) that need to be implemented and landed in the Liberty release. Details on the background for this work is at this etherpad, this page is meant to be a concise summary & tracker of the work that needs to be done.