Fix libvirt VM location

roles/virtualization/templates/vm.xml.j2

@@ -24,7 +24,7 @@
   <devices>
     <disk type='file' device='disk'>
       <driver name='qemu' type='qcow2'/>
-      <source file='/var/lib/libvirt/images/{{ hostname }}.qcow2'/>
+      <source file='{{ vm_path | default('/var/lib/libvirt/images/') }}{{ hostname }}.qcow2'/>
       <target dev='vda' bus='virtio'/>
     </disk>
     <disk type="file" device="cdrom">