Migrates leader election to Lease API

I ran `make test` and got no errors back, I also ran the `tests/e2e/test.sh`
script and the process completed successfully. I believe this change completes
the migration to the Lease API but I'm not entirely certain. If someone can
verify this and/or provide any other feedback I'll greatly appreciate it!

controller/controller.go

@@ -864,11 +864,11 @@ func (ctrl *ProvisionController) Run(ctx context.Context) {
 	go ctrl.volumeStore.Run(ctx, DefaultThreadiness)
 
 	if ctrl.leaderElection {
-		rl, err := resourcelock.New("endpoints",
+		rl, err := resourcelock.New("leases",
 			ctrl.leaderElectionNamespace,
 			strings.Replace(ctrl.provisionerName, "/", "-", -1),
-			ctrl.client.CoreV1(),
 			nil,
+			ctrl.client.CoordinationV1(),
 			resourcelock.ResourceLockConfig{
 				Identity:      ctrl.id,
 				EventRecorder: ctrl.eventRecorder,