Merge pull request #37109 from Random-Liu/fix-lifecycle-hook-test

Automatic merge from submit-queue

Use netexec container in http lifecycle hook test.

Fixes https://github.com/kubernetes/kubernetes/issues/33636.

The original test is using `"echo -e \"HTTP/1.1 200 OK\n\" | nc -l -p 1234` as a simple http server.

However, it seems that this is not very reliable, which may response before golang thinks it should.
So we get the error:
```
I1106 06:14:13.325397    2096 logs.go:41] Unsolicited response received on idle HTTP channel starting with "HTTP/1.1 200 OK\n\n"; err=<nil>
```

This PR changes the test to use the `netexec` container which is a simple http server written by golang and used in many of our networking e2e test. It should be more reliable.
Mark 1.5 since this is fixing a 1.5 release blocking issue. Mark P0 to match the original issue.

@dchen1107

test/e2e/framework/pods.go

@@ -18,6 +18,7 @@ package framework
 
 import (
 	"fmt"
+	"regexp"
 	"sync"
 	"time"
 
@@ -173,3 +174,20 @@ func (c *PodClient) WaitForSuccess(name string, timeout time.Duration) {
 		},
 	)).To(Succeed(), "wait for pod %q to success", name)
 }
+
+// MatchContainerOutput gest output of a container and match expected regexp in the output.
+func (c *PodClient) MatchContainerOutput(name string, containerName string, expectedRegexp string) error {
+	f := c.f
+	output, err := GetPodLogs(f.ClientSet, f.Namespace.Name, name, containerName)
+	if err != nil {
+		return fmt.Errorf("failed to get output for container %q of pod %q", containerName, name)
+	}
+	regex, err := regexp.Compile(expectedRegexp)
+	if err != nil {
+		return fmt.Errorf("failed to compile regexp %q: %v", expectedRegexp, err)
+	}
+	if !regex.MatchString(output) {
+		return fmt.Errorf("failed to match regexp %q in output %q", expectedRegexp, output)
+	}
+	return nil
+}