tests: Drop qemuxml2argv- prefix for qemuxml2argv test cases

Similarly to the previous commit, rename .args files.

The files were renamed using the following commands. From
qemuxml2argvdata:

  for i in qemuxml2argv-*.args; do mv $i ${i#qemuxml2argv-}; done

and then (to fix broken symlinks) from qemuxml2argvdata and
qemuxml2xmloutdata:

  for i in $(find . -xtype l); do \
      ln -sf $(readlink $i | sed 's/qemuxml2argv-//') $i;
  done

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

tests/qemuxml2argvdata/q35-noacpi-nouefi.args

@@ -0,0 +1,24 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name guest \
+-S \
+-M q35 \
+-cpu Haswell \
+-m 1024 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 496d7ea8-9739-544b-4ebd-ef08be936e8b \
+-nographic \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-guest/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline \
+-no-acpi \
+-boot c \
+-kernel /var/lib/libvirt/images/guest.vmlinuz \
+-initrd /var/lib/libvirt/images/guest.initramfs \
+-append 'rw root=/dev/vda rootwait'