af99d9e4e1
There wasn't really a good overview on how to use placement, so I've tried to start something by expanding on how nova uses placement in very broad strokes. The intent here is not to instruct people on the details of how to manage resources with placement, rather that they _can_ manage resources with placement and here's the major steps involved. Change-Id: I11cd622162efce2e87a21fa5ae5d297f4b248541