CP-5845: Fix partially applied helper function

The call_api_functions was only partially applied and so the function couldn't
be used as a comparitor for the Schwarzian transform sort.

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Don't allow changing of VGPUs for running VMs

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Change how PGPU.set_GPU_group is called via the CLI

Instead of

  xe pgpu-set-gpu-group uuid=... gpu-group-uuid=...

a user now needs to call

  xe pgpu-param-set uuid=... gpu-group-uuid=...

for consistency with other CLI setters.

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