`config_linux.go` and `config_windows.go` are identical.
`config_unsupported.go` is also almost identical but enables debug logs by default.
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
The github.com/containerd/containerd/services/server has a lot of
dependencies, like content, snapshots services implementation and
docker-metrics.
For the client side, it uses the config struct from server package
to start up the containerd in background. It will import a lot of
useless packages which might be conflict with existing vendor's package.
It makes integration easier with single config package.
Signed-off-by: Wei Fu <fuweid89@gmail.com>