Fix one test regression on auth Ceph support

The extra data need to be added to one test case

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-rbd.args

@@ -2,6 +2,6 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \
 /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -monitor \
 unix:/tmp/test-monitor,server,nowait -no-acpi -boot c -drive \
 file=/dev/HostVG/QEMUGuest1,if=ide,bus=0,unit=0 -drive \
-file=rbd:pool/image:\
+file=rbd:pool/image:auth_supported=none:\
 mon_host=mon1.example.org\:6321\;mon2.example.org\:6322\;mon3.example.org\:6322,\
 if=virtio,format=raw -net none -serial none -parallel none -usb