Fix gate in iax-ord node when using libvirt 2.0

Change-Id: Ifacc2462db2bcd7c8091a23c30e9442ec0140c97
Closes-Bug: #1653863

tools/deploy_aio.sh

@@ -84,6 +84,8 @@ EOF
     cat << EOF > /etc/kolla/config/nova/nova-compute.conf
 [libvirt]
 virt_type=qemu
+# NOTE(Jeffrey4l): fix the gate in iax-ord nodes for libvirt 2.0.
+cpu_mode=none
 EOF
 }