ERP5Type: allow to load former MembershipTool

also remove dead code

product/ERP5Type/__init__.py

@@ -189,3 +189,18 @@ import zExceptions
 ModuleSecurityInfo('zExceptions').declarePublic(*filter(
   lambda x: Exception in getattr(getattr(zExceptions, x), '__mro__', ()),
   dir(zExceptions)))
+
+# BBB : allow load of fomer Products.CMFDefault.MembershipTool
+# that has been replaced by Products.CMFCore.MembershipTool
+try:
+  from Products.CMFDefault.MembershipTool import MembershipTool
+except ImportError:
+  import sys, imp
+  m = 'Products.CMFDefault'
+  sys.modules[m] = imp.new_module(m)
+  m += ".MembershipTool"
+  sys.modules[m] = m = imp.new_module(m)
+  from Products.CMFCore.MembershipTool import MembershipTool
+  m.MembershipTool = MembershipTool
+  del m
+

product/ERP5Type/dynamic/portal_type_class.py

@@ -468,14 +468,6 @@ def synchronizeDynamicModules(context, force=False):
         except AttributeError:
           pass # no Activity Tool yet
 
-        from Products.CMFCore.MembershipTool import MembershipTool
-        tool = getattr(portal, "portal_membership", None)
-        if tool and tool.__class__ is not MembershipTool:
-          assert not tool._p_changed
-          tool.__class__ = MembershipTool
-          assert tool._p_changed
-          migrate = True
-
         for tool_id in ("portal_properties", "portal_uidannotation",
                         "portal_uidgenerator", "portal_uidhandler"):
           if portal.hasObject(tool_id):