testDms: use _baseSetData to replace setData which cause data base conflict?...

testDms: use _baseSetData to replace setData which cause data base conflict? not sure if this is a good solution.

product/ERP5OOo/tests/testDms.py

@@ -2169,7 +2169,7 @@ return 1
                                                reference='Embedded-XXX',
                                                version='001',
                                                language='en')
-    image.setData(upload_file.read())
+    image._baseSetData(upload_file.read())
     image.publish()
     convert_kw['quality'] = 99 # to not get cached
     web_page_document = self.portal.web_page_module.newContent(portal_type="Web Page")