Problem:
Configuring qos-class features in containerd requres a custom containerd configuration template.

Solution:
Look for configuration files in default locations and configure containerd to use them if they exist.
Signed-off-by: Oliver Larsson <larsson.e.oliver@gmail.com>
(cherry picked from commit 30c8ad92)
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>