erp5_catalog: Do not use lazy_class objects while generating UIDs

Earlier, class for any Catalog object used to be Products.ZSQLCatalog.SQLCatalog,
but now as we have shifted SQLCatalog to ERP5Catalog, the catalog objects have
lazy_class 'erp5.portal_type.Catalog' as their 1st class in mro. This class
don't have the required attributes.

The lazy_class is dynamic, so its not possible for them to save reserved IDs
as their attributes. So, we use the next class in mro, which would be
class 'Products.ERP5Catalog.ERP5Catalog' and save attributes in it.

Notice that this change of 'self.__klass__' is not required if
we are starting a lock with '_reserved_uid_lock' and then acquire-release it
consicutively in one go(transaction).

product/ZSQLCatalog/SQLCatalog.py

@@ -1133,6 +1133,10 @@ class Catalog(Folder,
   security.declarePrivate('getUIDBuffer')
   def getUIDBuffer(self, force_new_buffer=False):
     klass = self.__class__
+    if klass.__module__ == 'erp5.portal_type':
+      # For lazy_class object, take the class from mro, rather than relying
+      # on lazy_class object
+      klass = self.__class__.mro()[1]
     assert klass._reserved_uid_lock.locked()
     assert getattr(self, 'aq_base', None) is not None
     instance_key = self.getPhysicalPath()
@@ -1151,6 +1155,10 @@ class Catalog(Folder,
       Produces reserved uids in advance
     """
     klass = self.__class__
+    if klass.__module__ == 'erp5.portal_type':
+      # For lazy_class object, take the class from mro, rather than relying
+      # on lazy_class object
+      klass = self.__class__.mro()[1]
     assert klass._reserved_uid_lock.locked()
     # This checks if the list of local reserved uids was cleared after clearReserved
     # had been called.
@@ -1243,6 +1251,10 @@ class Catalog(Folder,
       return None
 
     klass = self.__class__
+    if klass.__module__ == 'erp5.portal_type':
+      # For lazy_class object, take the class from mro, rather than relying
+      # on lazy_class object
+      klass = self.__class__.mro()[1]
     try:
       klass._reserved_uid_lock.acquire()
       self.produceUid()