tests/qemu-iotests/172: Run QEMU with -vga none and -nic none

This way QEMU won't complain in case the VGA card or the NIC device
are not available in the binary, thus it won't spoil the output
and the test then passes with such QEMU binaries that have a limited
configuration, too.

Message-Id: <20230512124033.502654-18-thuth@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qemu-iotests/172

@@ -56,7 +56,7 @@ do_run_qemu()
             done
         fi
         echo quit
-    ) | $QEMU -accel qtest -nographic -monitor stdio -serial none "$@"
+    ) | $QEMU -accel qtest -nographic -monitor stdio -serial none -vga none -nic none "$@"
     echo
 }