Trivial: Revise the code annotation in cluster_add_nodes2
Trivial: Revise the code annotation in cluster_add_nodes2

This patch revises the code annotation about the node check
in cluster_add_nodes2.

Change-Id: I721438f00b94f2d93fbcbeaa1b0deb2fe66e7791

openstack/senlin,openstack/senlin,openstack/senlin,stackforge/senlin,stackforge/senlin