Add option to skip cpu feature and model verification in libvirt and rely on qemu 'enforce' option

[John Levon]

On Wed, Nov 23, 2022 at 11:48:17AM +0000, Daniel P. Berrangé wrote:

> > We're struggling to see what value the libvirt layer is bringing us in this
> > area, as opposed to a single-source-of-truth approach.
> 
> Well libvirt's job is to insulate applications from the specific hypervisor
> implementation details.

Sure, of course, this isn't relevant to other drivers or something that would be
turned on from (say) a virt-manager context. We're not trying to argue this
should be a default or anything, but this would hardly be the first thing that's
only supported by the qemu driver.

regards
john