tests: qemuxml2argv: Remove unused data for 'pseries-disk'

The last use was removed in 7b604379 when we deleted the old
commandline parser. The same functionality is tested by many tests for
pseries guests.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

tests/qemuxml2argvdata/pseries-disk.args

-LC_ALL=C \
-PATH=/bin \
-HOME=/home/test \
-USER=test \
-LOGNAME=test \
-QEMU_AUDIO_DRV=none \
-/usr/bin/qemu-system-ppc64 \
--name QEMUGuest1 \
--S \
--M pseries \
--m 512 \
--smp 1 \
--no-acpi \
--boot c \
--usb \
--boot c \
--hda /dev/HostVG/QEMUGuest1 \
--cdrom /root/boot.iso

tests/qemuxml2argvdata/pseries-disk.xml

-<domain type='qemu'>
-  <name>QEMUGuest1</name>
-  <uuid>87eedafe-eedc-4336-8130-ed9fe5dc90c8</uuid>
-  <memory unit='KiB'>524288</memory>
-  <currentMemory unit='KiB'>524288</currentMemory>
-  <vcpu placement='static'>1</vcpu>
-  <os>
-    <type arch='ppc64' machine='pseries'>hvm</type>
-    <boot dev='hd'/>
-  </os>
-  <clock offset='utc'/>
-  <on_poweroff>destroy</on_poweroff>
-  <on_reboot>restart</on_reboot>
-  <on_crash>destroy</on_crash>
-  <devices>
-    <emulator>/usr/bin/qemu-system-ppc64</emulator>
-    <disk type='block' device='disk'>
-      <driver name='qemu' type='raw'/>
-      <source dev='/dev/HostVG/QEMUGuest1'/>
-      <target dev='hda' bus='scsi'/>
-      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
-    </disk>
-    <disk type='file' device='cdrom'>
-      <driver name='qemu' type='raw'/>
-      <source file='/root/boot.iso'/>
-      <target dev='hdc' bus='scsi'/>
-      <readonly/>
-      <address type='drive' controller='0' bus='0' target='0' unit='2'/>
-    </disk>
-    <controller type='usb' index='0'/>
-    <controller type='scsi' index='0'/>
-    <controller type='pci' index='0' model='pci-root'/>
-    <input type='keyboard' bus='usb'/>
-    <input type='mouse' bus='usb'/>
-    <graphics type='sdl'/>
-    <video>
-      <model type='cirrus' vram='16384' heads='1'/>
-    </video>
-    <memballoon model='none'/>
-    <panic model='pseries'/>
-  </devices>
-</domain>