devcg: introduce proper hierarchy support

This patchset implements device cgroup hierarchy. Behaviors and exceptions
will be propagated down in the tree and local preferences will be re-evaluated
everytime a change in its parent occours, reapplying them if it's still
possible.

Cc: Tejun Heo <tj@kernel.org>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Aristeu Rozanski <aris@redhat.com>

-- 
Aristeu
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