update vendor to use containerd cgroups

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

@@ -0,0 +1,47 @@
+/*
+   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 (
+	"errors"
+	"os"
+)
+
+var (
+	ErrInvalidPid               = errors.New("cgroups: pid must be greater than 0")
+	ErrMountPointNotExist       = errors.New("cgroups: cgroup mountpoint does not exist")
+	ErrInvalidFormat            = errors.New("cgroups: parsing file with invalid format failed")
+	ErrFreezerNotSupported      = errors.New("cgroups: freezer cgroup not supported on this system")
+	ErrMemoryNotSupported       = errors.New("cgroups: memory cgroup not supported on this system")
+	ErrCgroupDeleted            = errors.New("cgroups: cgroup deleted")
+	ErrNoCgroupMountDestination = errors.New("cgroups: cannot find cgroup mount destination")
+)
+
+// ErrorHandler is a function that handles and acts on errors
+type ErrorHandler func(err error) error
+
+// IgnoreNotExist ignores any errors that are for not existing files
+func IgnoreNotExist(err error) error {
+	if os.IsNotExist(err) {
+		return nil
+	}
+	return err
+}
+
+func errPassthrough(err error) error {
+	return err
+}