Merge pull request #53937 from dims/duplicate-constant-in-kubeadm

Automatic merge from submit-queue. 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>.

Duplicate a constant - LabelNodeRoleMaster

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

Per request from @luxas in 53458, to avoid cmd/kubeadm to
depend on pkg/controller/service. Added a comment to make
this clear.

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

cmd/kubeadm/app/constants/BUILD

@@ -11,7 +11,6 @@ go_library(
     srcs = ["constants.go"],
     importpath = "k8s.io/kubernetes/cmd/kubeadm/app/constants",
     deps = [
-        "//pkg/controller/service:go_default_library",
         "//pkg/util/version:go_default_library",
         "//vendor/k8s.io/api/core/v1:go_default_library",
     ],

cmd/kubeadm/app/constants/constants.go

@@ -24,7 +24,6 @@ import (
 	"time"
 
 	"k8s.io/api/core/v1"
-	"k8s.io/kubernetes/pkg/controller/service"
 	"k8s.io/kubernetes/pkg/util/version"
 )
 
@@ -132,7 +131,8 @@ const (
 	DefaultTokenDuration = 24 * time.Hour
 
 	// LabelNodeRoleMaster specifies that a node is a master
-	LabelNodeRoleMaster = service.LabelNodeRoleMaster
+	// This is a duplicate definition of the constant in pkg/controller/service/service_controller.go
+	LabelNodeRoleMaster = "node-role.kubernetes.io/master"
 
 	// MasterConfigurationConfigMap specifies in what ConfigMap in the kube-system namespace the `kubeadm init` configuration should be stored
 	MasterConfigurationConfigMap = "kubeadm-config"