As much as possible, remove dependence on python 2.5
diff --git a/tools/pylibopenflow/bin/pyopenflow-pythonize.py b/tools/pylibopenflow/bin/pyopenflow-pythonize.py
old mode 100755
new mode 100644
index 97b7c8f..6da4af9
--- a/tools/pylibopenflow/bin/pyopenflow-pythonize.py
+++ b/tools/pylibopenflow/bin/pyopenflow-pythonize.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2.5
+#!/usr/bin/env python
"""This script generate openflow-packets.py which
creates Python class for each data structure in openflow.h.