Fix cassandra backup.

Issue-ID: OOM-2528
Signed-off-by: Marat Salakhutdinov <marat.salakhutdinov@bell.ca>
Change-Id: I210cd4bd8e0edf363d37ab7fc4f9f47e018010be
diff --git a/kubernetes/common/cassandra/resources/exec.py b/kubernetes/common/cassandra/resources/exec.py
index 5b3ae33..a7f2973 100644
--- a/kubernetes/common/cassandra/resources/exec.py
+++ b/kubernetes/common/cassandra/resources/exec.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 import getopt
 import logging
 import os
@@ -7,7 +7,7 @@
 
 from kubernetes import config
 from kubernetes.client import Configuration
-from kubernetes.client.apis import core_v1_api
+from kubernetes.client.api import core_v1_api
 from kubernetes.client.rest import ApiException
 from kubernetes.stream import stream