Besides migrating Tools .py, this also moves the Tools themselves (portal_*):
 * Some of them were created before erp5_core being installed and this
   would not work anymore as their .py is now in erp5_core.
 * Some others were created after (via setupLastTool()) and this would not
   work neither as sub-objects may be installed by erp5_core.

Add them to template_keep_path_list to prevent them from being re-created like
ERP5Site.addERP5Tool() used to do (depend on 3180424b, 91393be2).

Not migrated:
  * AlarmTool: Needed for upgrader.
  * CategoryTool, IdTool: Bootstrap.
  * TemplateTool, TrashTool: Business Template installation.
  * SolverTool: TypeProvider.
  * ContributionTool: Imported by Products.ERP5.Document.Document used in many places, will be done later.
  * NotificationTool: Imported by ERP5.Document.EmailDocument, will be done later.