Add nodes failing with "Failed to find subsystem mount for required subsystem: pids"

Issue

After running the openshift-node/scaleup.yml palybook, new nodes show up as NotReady and the following message is displayed by the atomic-openshift-node service during the startup process:

Dec 05 10:53:18 new_node01.example.redhat.com atomic-openshift-node[37927]: F1205 10:53:18.913010   37927 kubelet.go:1316] Failed to start ContainerManager failed to initialize top level QOS containers: failed to update t         op level Burstable QOS cgroup : failed to set supported cgroup subsystems for cgroup [kubepods burstable]: Failed to find subsystem mount for required subsystem: pids