Fix erp5_web_service tests in Python 2.

The if in this change was not being reached in Python 2, because in
this version the repr includes a comma after the message. I have
chosen instead to do the same that was being done before commit
9f4cf295, but changing `message`
(which does not exist in Python 3) to `args[0]` which can be used in
both Python versions.

bt5/erp5_web_service/MixinTemplateItem/portal_components/mixin.erp5.RESTAPIClientConnectorMixin.py

@@ -135,7 +135,7 @@ class RESTAPIClientConnectorMixin(XMLObject):
       http_response = http_connection.getresponse()
       request_stop_time = time.time()
     except ssl.SSLError as exc:
-      if "SSLError('The read operation timed out')" == repr(exc):
+      if 'The read operation timed out' == exc.args[0]:
         LOG(__name__, ERROR, "Call to %s %s raised Timeout (%ss)" %(
           method, path, round(time_left_before_timeout, 6)
         ), error=True)