068e200711
This makes sure that if the daemon root was already a self-binded mount (thus meaning the daemonc only performed a remount) that the daemon does not try to unmount. Example: ``` $ sudo mount --bind /var/lib/docker /var/lib/docker $ sudo dockerd & ``` Signed-off-by: Brian Goff <cpuguy83@gmail.com> Upstream-commit: c403f0036b9945bd58a84e2c93f794ed9861fe99 Component: engine