Modify the info passed to ScaleDownStatusProcessor when empty nodes are deleted
Modify the info passed to ScaleDownStatusProcessor when empty nodes are deleted

Previously, if any of the nodes fails to delete, the processor gets
a ScaleDownError status. After this commit, it will get the list of
nodes that were successfully deleted.

kubernetes/autoscaler,mmerrill3/autoscaler,bskiba/autoscaler,mmerrill3/autoscaler,mmerrill3/autoscaler,bskiba/autoscaler,kubernetes/autoscaler,bskiba/autoscaler,mmerrill3/autoscaler,kubernetes/autoscaler,kubernetes/autoscaler