osmo_ctrl.py: Set shebang to use python v2

Nowadays bin/python usually points to python3, and this script is written
in python2, which means if run directly from terminal it will fail with
some print syntax errors.

Change-Id: I24a568fc2c3e69e7c9f7b9729bd023fe1f0691c7

osmopy/osmo_ctrl.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2
 # -*- mode: python-mode; py-indent-tabs-mode: nil -*-
 """
 /*