fix iteritems for python 3

(cherry picked from commit 19fdb58948)

lib/ansible/module_utils/cloudstack.py

@@ -28,6 +28,7 @@
 # USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import time
+from ansible.module_utils.six import iteritems
 
 try:
     from cs import CloudStack, CloudStackException, read_config