VGPU version bump changes

Signed-off-by: John Else <john.else@citrix.com>
Add the VGPU_type object to the API

Signed-off-by: John Else <john.else@citrix.com>
Add field GPU_group.available_VGPU_types

Signed-off-by: John Else <john.else@citrix.com>
Add dummy implementation of PGPU.set_GPU_group

Signed-off-by: John Else <john.else@citrix.com>