Open Stack

https://review.openstack.org/#/c/127609/

This is a fundamental building block for the #3 priority (Scheduler) 
work in Kilo. It's been through 11 revisions so far and has support from 
at least one nova-driver and 4 non-drivers.

This work is a building block for the scheduler because it changes the 
way we publish and consume a set of resources managed by the resource 
tracker and scheduler subsystems. It also replaces the extensible 
resource tracker with a more robust method of adding new resource classes.

Thanks,
-jay