explicitly refer to python2

diff --git a/clientbin/sfi.py b/clientbin/sfi.py
index a3b7de7..3778c5e 100755 (executable)
--- a/clientbin/sfi.py
+++ b/clientbin/sfi.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 # sfi -- slice-based facility interface