Fix kubelet_kubelet_cgroups_cgroupfs (#8500)
Fix kubelet_kubelet_cgroups_cgroupfs (#8500)

If kubelet is run with systemd (as it always is when using kubespray),
it starts in systemd's /system.slice/kubelet.service cgroup.

This commit prevents a creation and usage of a second unrelated cgroup.
Atoms/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray