Use charm env in actions to get have charmhelpers available

cluster/juju/layers/kubernetes-master/actions/create-rbd-pv

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/local/sbin/charm-env python3
 
 # Copyright 2015 The Kubernetes Authors.
 #

cluster/juju/layers/kubernetes-master/actions/namespace-create

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/local/sbin/charm-env python3
 import os
 from yaml import safe_load as load
 from charmhelpers.core.hookenv import (

cluster/juju/layers/kubernetes-worker/actions/microbot

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/local/sbin/charm-env python3
 
 # Copyright 2015 The Kubernetes Authors.
 #

cluster/juju/layers/kubernetes-worker/actions/registry

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/local/sbin/charm-env python3
 #
 # For a usage examples, see README.md
 #