Revert "slapos_erp5: drop PAS shadow user plugins"

This reverts commit dc667e94.

Needed for accounting

master/bt5/slapos_erp5/SkinTemplateItem/portal_skins/slapos_erp5/CertificateAuthorityTool_checkSlapOSPASConsistency.py

@@ -10,10 +10,12 @@ slapos_plugin_dict = {
   ],
   'IGroupsPlugin': [
     'ZODB Group Manager',
+    'SlapOS Shadow Authentication Plugin',
     'ERP5 Group Manager'
   ],
   'IUserEnumerationPlugin': [
     'ZODB User Manager',
+    'SlapOS Shadow Authentication Plugin',
     'ERP5 Login User Manager'
   ]
 }