This allows non-privileged users to use containerd.
If a non root user tried to set a negative oom score adjustment,
it will fail. Containerd should not fail if running rootless.
This is part of a larger track of work integrating containerd
into Cloudfoundry's garden with support for rootless.
[#156343443]
Signed-off-by: Danail Branekov <danailster@gmail.com>
