Brian Goff 068e200711 Extra check before unmounting on shutdown ...

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

2018-04-18 20:43:42 -04:00

..

engine

Extra check before unmounting on shutdown

2018-04-18 20:43:42 -04:00