Add AcceleratorType:None resources for nodes without GPUs

[ericl]

(1) The current accelerator auto-detection should add "None" if no GPU is detected. This allows tasks to force placement on CPU-only nodes if needed.
(2) We should document this as a way to resolve the issue of CPU tasks being scheduled onto GPU nodes (along with the workaround of setting num_cpus=0 on those nodes).

More generally, we should consider adding anti-affinity support to the scheduler.

[scv119]

@ericl is this still relevant?

[ericl]

We should do it, but it's not particularly pressing.

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