Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/k8s.io/kubernetes/cmd/kubeadm/app/util/cgroupdriver.go

@@ -0,0 +1,75 @@
+/*
+Copyright 2018 The Kubernetes 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 util
+
+import (
+	"fmt"
+	"strings"
+
+	utilsexec "k8s.io/utils/exec"
+)
+
+// TODO: add support for detecting the cgroup driver for CRI other than
+// Docker. Currently only Docker driver detection is supported:
+// Discussion:
+//     https://github.com/kubernetes/kubeadm/issues/844
+
+// GetCgroupDriverDocker runs 'docker info' to obtain the docker cgroup driver
+func GetCgroupDriverDocker(execer utilsexec.Interface) (string, error) {
+	info, err := callDockerInfo(execer)
+	if err != nil {
+		return "", err
+	}
+	return getCgroupDriverFromDockerInfo(info)
+}
+
+func validateCgroupDriver(driver string) error {
+	if driver != "cgroupfs" && driver != "systemd" {
+		return fmt.Errorf("unknown cgroup driver %q", driver)
+	}
+	return nil
+}
+
+// TODO: Docker 1.13 has a new way to obatain the cgroup driver:
+//     docker info -f "{{.CgroupDriver}}
+// If the minimum supported Docker version in K8s becomes 1.13, move to
+// this syntax.
+func callDockerInfo(execer utilsexec.Interface) (string, error) {
+	out, err := execer.Command("docker", "info").Output()
+	if err != nil {
+		return "", fmt.Errorf("cannot execute 'docker info': %v", err)
+	}
+	return string(out), nil
+}
+
+func getCgroupDriverFromDockerInfo(info string) (string, error) {
+	lineSeparator := ": "
+	prefix := "Cgroup Driver"
+	for _, line := range strings.Split(info, "\n") {
+		if !strings.Contains(line, prefix+lineSeparator) {
+			continue
+		}
+		lineSplit := strings.Split(line, lineSeparator)
+		// At this point len(lineSplit) is always >= 2
+		driver := lineSplit[1]
+		if err := validateCgroupDriver(driver); err != nil {
+			return "", err
+		}
+		return driver, nil
+	}
+	return "", fmt.Errorf("cgroup driver is not defined in 'docker info'")
+}