Merge pull request #52538 from kad/no-ttl-warning

Automatic merge from submit-queue (batch tested with PRs 52445, 52380, 52516, 52531, 52538). 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>..

Remove warning about changes in default token TTLs

**What this PR does / why we need it**:
It was planned for 1.9 cleanup to remove that warning, as change was
done few release cycles ago and users should be already aware of it.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes kubernetes/kubeadm#346

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```

cmd/kubeadm/app/cmd/init.go

@@ -128,12 +128,6 @@ func NewCmdInit(out io.Writer) *cobra.Command {
 			i, err := NewInit(cfgPath, internalcfg, skipPreFlight, skipTokenPrint, dryRun)
 			kubeadmutil.CheckErr(err)
 			kubeadmutil.CheckErr(i.Validate(cmd))
-
-			// TODO: remove this warning in 1.9
-			if !cmd.Flags().Lookup("token-ttl").Changed {
-				fmt.Println("[kubeadm] WARNING: starting in 1.8, tokens expire after 24 hours by default (if you require a non-expiring token use --token-ttl 0)")
-			}
-
 			kubeadmutil.CheckErr(i.Run(out))
 		},
 	}

cmd/kubeadm/app/cmd/token.go

@@ -110,12 +110,6 @@ func NewCmdToken(out io.Writer, errW io.Writer) *cobra.Command {
 			client, err := getClientset(kubeConfigFile, dryRun)
 			kubeadmutil.CheckErr(err)
 
-			// TODO: remove this warning in 1.9
-			if !tokenCmd.Flags().Lookup("ttl").Changed {
-				// sending this output to stderr s
-				fmt.Fprintln(errW, "[kubeadm] WARNING: starting in 1.8, tokens expire after 24 hours by default (if you require a non-expiring token use --ttl 0)")
-			}
-
 			err = RunCreateToken(out, client, token, tokenDuration, usages, extraGroups, description)
 			kubeadmutil.CheckErr(err)
 		},