Merge pull request #65157 from caesarxuchao/cherrypick-65034-1.10

Automatic merge from submit-queue.

Manually cherrypick #65034 to 1.10

Manually cherrypicking #65034. Using hack/cherry_pick_pull.sh to cherrypick is difficult because that requires cherrypicking #63059 first.

This PR imported the latest jsoniterator library so that case sensitivity during unmarhsaling is optional. The PR also set Kubernetes json serializer to be case sensitive.

Fix #64612.

```release-notes
Kubernetes json deserializer is now case-sensitive to restore compatibility with pre-1.8 servers.
If your config files contains fields with wrong case, the config files will be now invalid.
```

Kubernetes-commit: 32ac1c9073b132b8ba18aa830f46b77dcceb0723

vendor/github.com/modern-go/concurrent/log.go

@@ -0,0 +1,13 @@
+package concurrent
+
+import (
+	"os"
+	"log"
+	"io/ioutil"
+)
+
+// ErrorLogger is used to print out error, can be set to writer other than stderr
+var ErrorLogger = log.New(os.Stderr, "", 0)
+
+// InfoLogger is used to print informational message, default to off
+var InfoLogger = log.New(ioutil.Discard, "", 0)