tests: Reflow the expected output from RBD disk test

Addition of tested cases to the test will be more obvious.

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

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