Use a client interface instead of a concrete type

Aids testing

cmd/cloud-controller-manager/app/controllermanager.go

@@ -172,7 +172,7 @@ func Run(s *options.CloudControllerManagerServer, cloud cloudprovider.Interface)
 			Namespace: "kube-system",
 			Name:      "cloud-controller-manager",
 		},
-		Client: leaderElectionClient,
+		Client: leaderElectionClient.Core(),
 		LockConfig: resourcelock.ResourceLockConfig{
 			Identity:      id + "-external-cloud-controller",
 			EventRecorder: recorder,

cmd/kube-controller-manager/app/controllermanager.go

@@ -200,7 +200,7 @@ func Run(s *options.CMServer) error {
 	rl, err := resourcelock.New(s.LeaderElection.ResourceLock,
 		"kube-system",
 		"kube-controller-manager",
-		leaderElectionClient,
+		leaderElectionClient.Core(),
 		resourcelock.ResourceLockConfig{
 			Identity:      id,
 			EventRecorder: recorder,

plugin/cmd/kube-scheduler/app/server.go

@@ -121,7 +121,7 @@ func Run(s *options.SchedulerServer) error {
 	rl, err := resourcelock.New(s.LeaderElection.ResourceLock,
 		s.LockObjectNamespace,
 		s.LockObjectName,
-		kubecli,
+		kubecli.Core(),
 		resourcelock.ResourceLockConfig{
 			Identity:      id,
 			EventRecorder: recorder,

staging/src/k8s.io/client-go/tools/leaderelection/resourcelock/BUILD

@@ -18,7 +18,6 @@ go_library(
     deps = [
         "//vendor/k8s.io/api/core/v1:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
-        "//vendor/k8s.io/client-go/kubernetes:go_default_library",
         "//vendor/k8s.io/client-go/kubernetes/typed/core/v1:go_default_library",
         "//vendor/k8s.io/client-go/tools/record:go_default_library",
     ],

staging/src/k8s.io/client-go/tools/leaderelection/resourcelock/interface.go

@@ -20,7 +20,7 @@ import (
 	"fmt"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	cs "k8s.io/client-go/kubernetes"
+	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
 	"k8s.io/client-go/tools/record"
 )
 
@@ -76,7 +76,7 @@ type Interface interface {
 }
 
 // Manufacture will create a lock of a given type according to the input parameters
-func New(lockType string, ns string, name string, client *cs.Clientset, rlc ResourceLockConfig) (Interface, error) {
+func New(lockType string, ns string, name string, client corev1.CoreV1Interface, rlc ResourceLockConfig) (Interface, error) {
 	switch lockType {
 	case EndpointsResourceLock:
 		return &EndpointsLock{