Xen orchestra inventory plugin (#3344)

* wip

* Renamed xo env variable with ANSIBLE prefix

* Suppress 3.x import and boilerplate errors

* Added shinuza as maintainer

* Do not use automatic field numbering spec

* Removed f string

* Fixed sanity checks

* wip tests

* Added working tests

* Fixed a bug when login fails

* Update plugins/inventory/xen_orchestra.py

Co-authored-by: Felix Fontein <felix@fontein.de>

Co-authored-by: Felix Fontein <felix@fontein.de>

.github/BOTMETA.yml

@@ -163,6 +163,8 @@ files:
     keywords: opennebula dynamic inventory script
   $inventories/proxmox.py:
     maintainers: $team_virt ilijamt
+  $inventories/xen_orchestra.py:
+    maintainers: shinuza
   $inventories/icinga2.py:
     maintainers: bongoeadgc6
   $inventories/scaleway.py: