Move *Flavor parameters into per-role templates

Move *Flavor parameters into per-role templates

We have some inconsistent naming here, but move them with their
current names for backwards compatibility, we can address the
deprecation of the inconsistent names at a future time.

This is required to enable jinja templating of roles in overcloud.yaml

Change-Id: I2ea673d9bc52967f9b7c25555059b964abf66966
Partially-Implements: blueprint custom-roles