Include cpu plugin in default collect plugins
Include cpu plugin in default collect plugins

It delivers a better idea on how the machine operates
than just having the load plugin.

Change-Id: Ide11718f33a9d656719ff714a324fbe9f3fc18e8

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates