py2/py3: use FileIO class instead of file class, that does not exist in Python 3.

bt5/erp5_safeimage/TestTemplateItem/portal_components/test.erp5.testSafeImage.py

 from Products.ERP5Type.tests.ERP5TypeTestCase import ERP5TypeTestCase
 import transaction
+from io import FileIO
 import os
 
 
-class FileUpload(file):
+class FileUpload(FileIO):
   """Act as an uploaded file.
   """
   __allow_access_to_unprotected_subobjects__ = 1
   def __init__(self, path, name):
     self.filename = name
-    file.__init__(self, path)
+    super(FileUpload, self).__init__(path)
     self.headers = {}
 
 

product/ERP5Type/tests/utils.py

@@ -57,6 +57,11 @@ import pytz
 import six
 import lxml.html
 
+if six.PY2:
+  FileIO = file
+else:
+  from io import FileIO
+
 
 def canonical_html(html):
   # type: (str) -> str
@@ -68,7 +73,7 @@ def canonical_html(html):
   ).decode('utf-8')
 
 
-class FileUpload(file):
+class FileUpload(FileIO):
   """Act as an uploaded file.
   """
   __allow_access_to_unprotected_subobjects__ = 1
@@ -76,9 +81,10 @@ class FileUpload(file):
     if name is None:
       name = os.path.basename(path)
     self.filename = name
-    file.__init__(self, path)
+    FileIO.__init__(self, path)
     self.headers = {}
 
+
 # dummy objects
 class DummyMailHostMixin(object):
   """Dummy Mail Host that doesn't really send messages and keep a copy in