qemuxml2xmltest: Add memfd tests

Somehow, these were not tested. Use symlinks to point expected
output back to the input. This way we can also fix some
discrepancies in the input XMLs.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

tests/qemuxml2argvdata/memfd-memory-numa.xml

@@ -1,20 +1,20 @@
-<domain type='kvm' id='56'>
+<domain type='kvm'>
   <name>instance-00000092</name>
   <uuid>126f2720-6f8e-45ab-a886-ec9277079a67</uuid>
   <memory unit='KiB'>14680064</memory>
   <currentMemory unit='KiB'>14680064</currentMemory>
   <memoryBacking>
     <hugepages>
-        <page size="2" unit="M"/>
+      <page size='2048' unit='KiB'/>
     </hugepages>
     <source type='memfd'/>
     <access mode='shared'/>
     <allocation mode='immediate'/>
   </memoryBacking>
-  <numatune>
-      <memnode cellid='0' mode='preferred' nodeset='3'/>
-  </numatune>
   <vcpu placement='static'>8</vcpu>
+  <numatune>
+    <memnode cellid='0' mode='preferred' nodeset='3'/>
+  </numatune>
   <os>
     <type arch='x86_64' machine='pc-i440fx-wily'>hvm</type>
     <boot dev='hd'/>
@@ -31,6 +31,14 @@
   <on_crash>destroy</on_crash>
   <devices>
     <emulator>/usr/bin/qemu-system-x86_64</emulator>
-    <memballoon model='virtio'/>
+    <controller type='usb' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </memballoon>
   </devices>
 </domain>