* make sure that when set_owner=False, nothing is tried on owernships at all

suppress_events=True or a call to manage_changeOwnershipType implies
a recursion in the imported objects, forcing portal type classes loads to
be able to return subojects: sometimes we do not want this.

This is required to be able to import XML files very early in the bootstrap
process without having zope to EVER recurse into the imported objects:
when installing portal_types/portal_property_sheets for bootstrap, we
  a) do not care about ownership
  b) do not care about oh-so-clever zope events



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42396 20353a03-c40f-0410-a6d1-a30d3c3de9de