In some cases, if a user specifies `-f` when disabling a plugin mounts
can still exist on the plugin rootfs.
This can cause problems during upgrade where the rootfs is removed and
may cause data loss.
To resolve this, ensure the rootfs is unmounted
before performing an upgrade.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
(cherry picked from commit 83f44d232d)
Signed-off-by: Victor Vieux <victorvieux@gmail.com>
2d8ebec4a8