testConflictResolution & testInvalidationBug still need to import 'transaction'

This revert a wrong change in commit 8995b645

bt5/test_conflict_resolution/TestTemplateItem/testConflictResolution.py

@@ -28,6 +28,7 @@
 
 import unittest
 import urllib
+import transaction
 import ZODB
 from ZODB.DemoStorage import DemoStorage
 from Products.ERP5Type.tests.ERP5TypeTestCase import ERP5TypeTestCase

bt5/test_conflict_resolution/bt/revision

-2
\ No newline at end of file
+3
\ No newline at end of file

product/ERP5/tests/testInvalidationBug.py

@@ -33,6 +33,7 @@ import threading
 import time
 import unittest
 import urllib
+import transaction
 from DateTime import DateTime
 from Testing import ZopeTestCase
 from Products.ERP5Type.tests.ERP5TypeTestCase import ERP5TypeTestCase