Generate separate INI files for Cases and Ops/PSC nodes.

NUBIC is moving towards a deployment model where there's one Ops and PSC
instance servicing many Cases instances.  This means that many
attributes shared between Ops and Cases are no longer that way.
Move Cases' Redis to the Cases VM.

Cases isn't set up to scope its Redis keys in a systematic way, so this
option is the easiest way to ensure a safe Redis environment for each
Cases instance.