These functions are not part of the graphdriver.Driver
interface and should therefore be private.
Also, remove comments added by commit e27c904 as they are
* pretty obvious
* no longer required by golint
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Upstream-commit: f5f7fee2ecc964314b2a7b910fda71a157c90f16
Component: engine