As a prerequisite for blueprint generic-mdevs we need to rename the
existing enabled_vgpu_types options and dynamically generated groups
into enabled_mdev_types.
There is no upgrade impact for existing users, as the original
options are still accepted.
NOTE(sbauza): As we have a lot of methods and objects named gpu-ish
let's just change what we need here and provide followups for
fixing internal tech debt later.
Change-Id: Idba094f6366a24965804b88da0bc1b9754549c99
Partially-Implements: blueprint generic-mdevs
ff4d0d002a