Separate RestartControllerManager() as e2ekubesystem

RestartControllerManager() is kube-controller specific function
and it is better to separate the function as subpackage of e2e
test framework.
In addition, the function made invalid dependency into e2essh.
So this separates the function into e2ekubesystem subpackage.

test/e2e/framework/kubesystem/kubesystem.go

@@ -0,0 +1,66 @@
+/*
+Copyright 2020 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 kubesystem
+
+import (
+	"fmt"
+	"net"
+	"strconv"
+	"time"
+
+	"k8s.io/kubernetes/test/e2e/framework"
+	e2essh "k8s.io/kubernetes/test/e2e/framework/ssh"
+)
+
+const (
+	// ssh port
+	sshPort = "22"
+)
+
+// RestartControllerManager restarts the kube-controller-manager.
+func RestartControllerManager() error {
+	// TODO: Make it work for all providers and distros.
+	if !framework.ProviderIs("gce", "aws") {
+		return fmt.Errorf("unsupported provider for RestartControllerManager: %s", framework.TestContext.Provider)
+	}
+	if framework.ProviderIs("gce") && !framework.MasterOSDistroIs("gci") {
+		return fmt.Errorf("unsupported master OS distro: %s", framework.TestContext.MasterOSDistro)
+	}
+	cmd := "pidof kube-controller-manager | xargs sudo kill"
+	framework.Logf("Restarting controller-manager via ssh, running: %v", cmd)
+	result, err := e2essh.SSH(cmd, net.JoinHostPort(framework.GetMasterHost(), sshPort), framework.TestContext.Provider)
+	if err != nil || result.Code != 0 {
+		e2essh.LogResult(result)
+		return fmt.Errorf("couldn't restart controller-manager: %v", err)
+	}
+	return nil
+}
+
+// WaitForControllerManagerUp waits for the kube-controller-manager to be up.
+func WaitForControllerManagerUp() error {
+	cmd := "curl http://localhost:" + strconv.Itoa(framework.InsecureKubeControllerManagerPort) + "/healthz"
+	for start := time.Now(); time.Since(start) < time.Minute; time.Sleep(5 * time.Second) {
+		result, err := e2essh.SSH(cmd, net.JoinHostPort(framework.GetMasterHost(), sshPort), framework.TestContext.Provider)
+		if err != nil || result.Code != 0 {
+			e2essh.LogResult(result)
+		}
+		if result.Stdout == "ok" {
+			return nil
+		}
+	}
+	return fmt.Errorf("waiting for controller-manager timed out")
+}