Minor tweaking to cluster controller in API
Minor tweaking to cluster controller in API

1. Make size a mandatory parameter; 2. Try extract 'cluster' key from
body first and throw exception is not found.

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