Skip test_get_smtp_server_extra_parameters on python version < 2.7.4

Older Python version does not parse query for smtp scheme.
https://bugs.python.org/issue9374

trytond/tests/test_sendmail.py

@@ -2,6 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 import unittest
 import smtplib
+import sys
 from email.message import Message
 from mock import Mock, patch, call
 
@@ -67,6 +68,7 @@ class SendmailTestCase(unittest.TestCase):
             SMTP.assert_called_once_with('localhost', 25)
             server.starttls.assert_called_once_with()
 
+    @unittest.skipIf(sys.version_info < (2, 7, 4), "python bug #9374")
     def test_get_smtp_server_extra_parameters(self):
         'Test get_smtp_server uri extra parameters'
         with patch.object(smtplib, 'SMTP') as SMTP: