CA-121671: Tighten up PGPU.set_enabled_VGPU_types
CA-121671: Tighten up PGPU.set_enabled_VGPU_types

The PGPU.remove_enabled_VGPU_types API checked if there were any VMs running of
that type before disabling the type. However, the set_enabled_VGPU_types call
(which may disable some types) made no such check.

Signed-off-by: Si Beaumont <a0992b7f1f450b4c7716d34b81a2d6f0877ae11a@citrix.com>

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