tests: Drop qemuxml2argv- prefix for qemuxml2argv-*.xml test cases

These XMLs live in a separate directory, there's no need for them
to have a special prefix in addition. It also doesn't play nicely
with ':e' completion in Vim, finding proper file based on
qemuxml2argvtest.c is also needlessly complicated.

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

  for i in qemuxml2argv-*.xml; 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.xml

@@ -0,0 +1,19 @@
+<domain type='qemu'>
+  <name>guest</name>
+  <uuid>496d7ea8-9739-544b-4ebd-ef08be936e8b</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='q35'>hvm</type>
+    <kernel>/var/lib/libvirt/images/guest.vmlinuz</kernel>
+    <initrd>/var/lib/libvirt/images/guest.initramfs</initrd>
+    <cmdline>rw root=/dev/vda rootwait</cmdline>
+  </os>
+  <cpu mode='custom'>
+    <model>Haswell</model>
+  </cpu>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <memballoon model='none'/>
+  </devices>
+</domain>