use python2

hbc

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # $Id: hbc,v 1.9 2012/03/29 02:08:36 andreas Exp $
 # NEW
 import sys

hbd

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # $Id: hbd,v 1.38 2013/07/14 02:25:05 andreas Exp $
 # Wait for heartbeat messages and act on them (or their absence)
 #