[cern] kubelet.service: rootfs must be rshared
By default, /rootfs is a private mount. When the kubelet
service is restarted, it copies mounts from node's / into
kubelet's /rootfs, but since they are private, no events
are shared between between these to locations.
This then makes it impossible to delete any pre-exisitng
Pods that use volumes, as they have stale mounts in /rootfs
even though their /var/lib/kubelet/pods/<UID>/volumes was
already unmounted.
This commit shares /rootfs, enabling mount events to be
propagated between both these locations, fixing the issue.
Fixes #43 (closed)