Move platformInit and plugin load to server

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

server/server_linux.go

@@ -0,0 +1,26 @@
+package server
+
+import (
+	"context"
+	"os"
+
+	"github.com/containerd/containerd/log"
+	"github.com/containerd/containerd/sys"
+)
+
+// apply sets config settings on the server process
+func apply(ctx context.Context, config *Config) error {
+	if config.Subreaper {
+		log.G(ctx).Info("setting subreaper...")
+		if err := sys.SetSubreaper(1); err != nil {
+			return err
+		}
+	}
+	if config.OOMScore != 0 {
+		log.G(ctx).Infof("changing OOM score to %d", config.OOMScore)
+		if err := sys.SetOOMScore(os.Getpid(), config.OOMScore); err != nil {
+			return err
+		}
+	}
+	return nil
+}