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.
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