This allows some special cgroup items such as memory.kmem.limit_in_bytes
to be successfully set, since they must be set before any task is put
into the cgroup.

The devices cgroup is setup later giving the container a chance to mount
file systems before the device it might want to mount from becomes
unavailable.
Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>