qemu_cpu.cfg: Force nettype=none

We don't need networking when running the CPUID dump kernel, so we can
simply skip networking setup.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

qemu/tests/cfg/qemu_cpu.cfg

@@ -12,6 +12,7 @@
     usbs =
     usb_devices =
     skip_image_processing = yes
+    nettype = none
 
     # ask autotest to not mess with the cpu_model settings
     auto_cpu_model = no