slapos_panel: simplify script

All outdated items should have a validation_state to validated

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/Project_getComputeNodeTrackingList.py

-# This script might not be efficient to a large quantities of
-# Compute Nodes
-from DateTime import DateTime
-
 kw.update({
-  "follow_up_uid": context.getUid(),
-  "portal_type": ['Instance Node', 'Remote Node', 'Compute Node', 'Instance Tree', 'Computer Network']
+  "follow_up__uid": context.getUid(),
+  "portal_type": ['Instance Node', 'Remote Node', 'Compute Node', 'Instance Tree', 'Computer Network'],
+  "validation_state": "validated"
 })
 
-def filter_per_portal_type(document):
-  if document.getPortalType() == "Compute Node" \
-      and document.getAllocationScope() != "close/forever":
-    return document
-  elif document.getPortalType() == "Instance Tree" \
-      and document.getSlapState() != "destroy_requested":
-    return document
-  elif document.getPortalType() == "Computer Network" \
-      and document.getValidationState() == "validated":
-    return document
-
-return [ i.getObject()
-           for i in context.getPortalObject().portal_catalog(**kw)
-             if filter_per_portal_type(i.getObject())]
+return context.getPortalObject().portal_catalog(**kw)