vmm/kvm: Fix version detection on newer qemu
vmm/kvm: Fix version detection on newer qemu

- Newer qemu uses a different version string that breaks validate_kvm().
Fix this.

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr