Fix classmethod call error
Fix classmethod call error

Some classmethod types are not correctly called in node.py module,
this patch fixes them.

Change-Id: Ia5f215292f181bef59553c543f1fea1d7218a900
Closes-Bug: #1471166

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