qemu_process: Always fix CPUs on reconnect

qemu_process: Always fix CPUs on reconnect

We fix CPUs (i.e., remove ignored CPU features) only when libvirt/QEMU
combo used to start the domain is very old and doesn't support
query-cpu-model-expansion, in which case the CPU definition may contain
features that are unknown to QEMU. But even if both libvirt and QEMU are
new enough, we still want to remove features that do nothing to minimize
confusion or to avoid false migration issues.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>