Correct deprecation of scale-in and scale-out cli
Correct deprecation of scale-in and scale-out cli

Senlin is going to switch to openstackclient after Apr,2017.
The corresponding command in openstackclient is cluster shrink
and cluster expand not quite familiar with python-senlinclient.
So it's better to correct deprecation in scale-in and scale-out
commands to inform user with the going change.

Change-Id: I29a277fa91a029a029512b1ff9f163fe51ed388b
closes-bug:#1645249

openstack/python-senlinclient,stackforge/python-senlinclient,stackforge/python-senlinclient,openstack/python-senlinclient