Update to run under Python 3

Updating charm to support execution under Python 3.

Change-Id: I1429d1c6b634959e0062a8e9f4bc615c58bf31e0

actions/actions.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 #
 # Copyright 2016 Canonical Ltd
 #
@@ -33,6 +33,8 @@ _add_path(_hooks)
 
 from charmhelpers.core.hookenv import action_fail
 
+sys.path.append('hooks/')
+
 from glance_utils import (
     pause_unit_helper,
     resume_unit_helper,