Move per-role *SchedulerHints parameters into role templates

Move per-role *SchedulerHints parameters into role templates

To enable custom roles, move these into the role templates where
they can be passed via parameter defaults.  Because the Compute
role uses an inconsistent NovaCompute naming, these parameters
cannot be generated in overcloud.yaml, so moving them enables
backwards compatibility to be maintained when we move to a
fully jinja generated overcloud (e.g including the role
ResourceGroup resources)

Change-Id: I3f9b2275f2b1daeb8b83f09548a089dadcfe9eee
Partially-Implements: blueprint custom-roles