py3: message attribute in exception was removed in Python 3.

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 'The read operation timed out' == exc.message:
+      if "SSLError('The read operation timed out')" == repr(exc):
         LOG(__name__, ERROR, "Call to %s %s raised Timeout (%ss)" %(
           method, path, round(time_left_before_timeout, 6)
         ), error=True)