Rootless dockerd refused to use overlay2 whenever SELinux was enabled
on the host, forcing users onto fuse-overlayfs:
```
overlay is not supported for Rootless with SELinux
```
The check was added for Fedora 34, where rootless overlayfs on kernel
5.11 hit SELinux denials.
That no longer happens on current hosts such as Fedora 41.
The containerd overlayfs snapshotter never had an equivalent check and
already runs natively in rootless mode with SELinux enforcing.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
Paweł Gronowski
1b1e60de6a