Remove two TODOs from cluster_action
Remove two TODOs from cluster_action

These two TODOs are not needed anymore since do_resize has been
implemented to support cluster size adjustment.

Change-Id: Iea90aa53c9ba95e20ed16532111d30244a24fe9c

openstack/senlin,openstack/senlin,stackforge/senlin,Alzon/senlin,tengqm/senlin-container,Alzon/senlin,openstack/senlin,stackforge/senlin,tengqm/senlin-container