Revert "UBUNTU: SAUCE: cgroup: Use a new super block when mounting in a cgroup namespace"

BugLink: http://bugs.launchpad.net/bugs/1588056



This reverts commit 794fbce4.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>