lxd/instance/qemu: Move to query-cpus-fast
lxd/instance/qemu: Move to query-cpus-fast

query-cpus is deprecated and will be dropped in 6.0.
For what we need, there is no practical difference.

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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