Merge pull request #64015 from cofyc/improvetests

Automatic merge from submit-queue (batch tested with PRs 62756, 63862, 61419, 64015, 64063). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Handle TERM signal to reduce pod terminating time.

**What this PR does / why we need it**:

Register signal handler for `TERM`.

For container, process is run as PID 1. PID 1 is special in linux, it ignore any signal with the default action. So process will not terminate on `SIGINT` or `SIGTERM` unless it is coded to do so.

By default, docker use `TERM` signal to termiante pods, it will wait 10 seconds before sending `KILL` signal.

```
$ docker run -d --rm --name test busybox sh -c 'while true; do sleep 1; done'
aa827df5d7bfffc5ca4fae2429d0b761a5a142c57ba3e1faa59b305c92f1c875
$ time docker stop test
test

real	0m10.408s
user	0m0.048s
sys	0m0.020s
```

It's better to register a exit handler for `TERM`, it reduces a lot of time in waiting pods to termiante.

```
$ docker run -d --rm --name test busybox sh -c 'trap exit TERM; while true; do sleep 1; done'
e331bff454dba8e45df6065c3bd2a928e1c41303aafdf88ede38def3e4e5781f
$ time docker stop test
test

real	0m0.690s
user	0m0.048s
sys	0m0.020s
```

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

test/e2e/framework/deployment_util.go

@@ -232,7 +232,7 @@ func CreateDeployment(client clientset.Interface, replicas int32, podLabels map[
 // name.  A slice of BASH commands can be supplied as args to be run by the pod
 func MakeDeployment(replicas int32, podLabels map[string]string, nodeSelector map[string]string, namespace string, pvclaims []*v1.PersistentVolumeClaim, isPrivileged bool, command string) *apps.Deployment {
 	if len(command) == 0 {
-		command = "while true; do sleep 1; done"
+		command = "trap exit TERM; while true; do sleep 1; done"
 	}
 	zero := int64(0)
 	deploymentName := "deployment-" + string(uuid.NewUUID())

test/e2e/framework/pv_util.go

@@ -815,7 +815,7 @@ func MakeWritePod(ns string, pvc *v1.PersistentVolumeClaim) *v1.Pod {
 // name.  A slice of BASH commands can be supplied as args to be run by the pod
 func MakePod(ns string, nodeSelector map[string]string, pvclaims []*v1.PersistentVolumeClaim, isPrivileged bool, command string) *v1.Pod {
 	if len(command) == 0 {
-		command = "while true; do sleep 1; done"
+		command = "trap exit TERM; while true; do sleep 1; done"
 	}
 	podSpec := &v1.Pod{
 		TypeMeta: metav1.TypeMeta{
@@ -902,7 +902,7 @@ func MakeNginxPod(ns string, nodeSelector map[string]string, pvclaims []*v1.Pers
 // SELinux testing requires to pass HostIPC and HostPID as booleansi arguments.
 func MakeSecPod(ns string, pvclaims []*v1.PersistentVolumeClaim, isPrivileged bool, command string, hostIPC bool, hostPID bool, seLinuxLabel *v1.SELinuxOptions, fsGroup *int64) *v1.Pod {
 	if len(command) == 0 {
-		command = "while true; do sleep 1; done"
+		command = "trap exit TERM; while true; do sleep 1; done"
 	}
 	podName := "security-context-" + string(uuid.NewUUID())
 	if fsGroup == nil {

test/e2e/framework/util.go

@@ -3474,7 +3474,7 @@ func newExecPodSpec(ns, generateName string) *v1.Pod {
 				{
 					Name:    "exec",
 					Image:   BusyBoxImage,
-					Command: []string{"sh", "-c", "while true; do sleep 5; done"},
+					Command: []string{"sh", "-c", "trap exit TERM; while true; do sleep 5; done"},
 				},
 			},
 		},