Bug#969223: Can't rm directory on overlayfs in userns

[Nicolas Schier <nicolas@fjasle.eu>]

> I think I just mess up when debugging. It seems it never works.
> 
> Maybe we should revert permit_mounts_in_userns? as it doesn't seem to
> work. Buster is also affected.

Please, don't be too fast when thinking about a revert.  Several of my
colleagues (Debian users) cling to the feature since they need it for
using the company's LXC containers; if permit_mounts_in_userns is
removed again, they might be forced to switch to non-Debian kernels or
to live-patch the kernel with fragile stuff like [1], cp. #913880.


[1]: https://rocketgit.com/user/nicolas/overlay-userns-dkms

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