Description of problem:
There is a QEMU && libvirt conflict regarding which features are needed to run a vmi with named CPU model.
To solve this we need to support a CPU model only if we have the requirements by both libvirt and qemu.

Version-Release number of selected component (if applicable):

How reproducible:
Try to create VMI with `x86_Icelake` when mpx is missing on the nodes.

Steps to Reproduce:
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Actual results:
VMI creation will fail with libvirt error

Expected results:
The node shouldn't have label for `x86_Icelake` in that case and virt-launcher pod shouldn't be scheduled.

Additional info:
For more information : https://wiki.qemu.org/Features/CPUModels in "Getting information about CPU models" section