Nova-libvirt needs to bind to /sys/fs/cgroup
Nova-libvirt needs to bind to /sys/fs/cgroup

Nova-compute was mounting in /sys/fs/cgroup when the libvirt
container is the one that actually needs it.

Change-Id: Iae5c7ad24083a8547474611d72f015c4fd23a073
dprince/tripleo-heat-templates,bcrochet/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,bcrochet/tripleo-heat-templates,trozet/opnfv-tht,trozet/opnfv-tht,trozet/opnfv-tht,bcrochet/tripleo-heat-templates,openstack/tripleo-heat-templates