Removed unnecessary version checks

Fixed 2 memory leaks in restricted.py

gluon/tests/test_tools.py

@@ -8,10 +8,7 @@ import os
 import sys
 import smtplib
 import datetime
-if sys.version < "2.7":
-    import unittest2 as unittest
-else:
-    import unittest
+import unittest
 
 from fix_path import fix_sys_path