update vendor to use containerd cgroups

vendor/github.com/containerd/cgroups/net_cls.go

@@ -0,0 +1,61 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package cgroups
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+func NewNetCls(root string) *netclsController {
+	return &netclsController{
+		root: filepath.Join(root, string(NetCLS)),
+	}
+}
+
+type netclsController struct {
+	root string
+}
+
+func (n *netclsController) Name() Name {
+	return NetCLS
+}
+
+func (n *netclsController) Path(path string) string {
+	return filepath.Join(n.root, path)
+}
+
+func (n *netclsController) Create(path string, resources *specs.LinuxResources) error {
+	if err := os.MkdirAll(n.Path(path), defaultDirPerm); err != nil {
+		return err
+	}
+	if resources.Network != nil && resources.Network.ClassID != nil && *resources.Network.ClassID > 0 {
+		return retryingWriteFile(
+			filepath.Join(n.Path(path), "net_cls.classid"),
+			[]byte(strconv.FormatUint(uint64(*resources.Network.ClassID), 10)),
+			defaultFilePerm,
+		)
+	}
+	return nil
+}
+
+func (n *netclsController) Update(path string, resources *specs.LinuxResources) error {
+	return n.Create(path, resources)
+}