slow_chown is safe to add on all kernels, and when running in old
kernels (as some CI distros on purpose are), we want the expensive
fallback.
Vagrant setup and others use this script to config containerd. This
fixes userns tests with runc 1.2.0-rc.2 when running with old kernels.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>
e1adfaeb92