Clean up Deployment overlap annotation code

pkg/controller/deployment/deployment_controller.go

@@ -594,20 +594,6 @@ func (dc *DeploymentController) syncDeployment(key string) error {
 		return nil
 	}
 
-	// This is the point at which we used to add/remove the overlap annotation.
-	// Now we always remove it if it exists, because it is obsolete as of 1.6.
-	// Although the server no longer adds or looks at the annotation,
-	// it's important to remove it from controllers created before the upgrade,
-	// so that old clients (e.g. kubectl reaper) know they can no longer assume
-	// the controller is blocked due to selector overlap and has no dependents.
-	if _, ok := d.Annotations[util.OverlapAnnotation]; ok {
-		delete(d.Annotations, util.OverlapAnnotation)
-		d, err = dc.client.ExtensionsV1beta1().Deployments(d.Namespace).UpdateStatus(d)
-		if err != nil {
-			return fmt.Errorf("couldn't remove obsolete overlap annotation from deployment %v: %v", key, err)
-		}
-	}
-
 	// List ReplicaSets owned by this Deployment, while reconciling ControllerRef
 	// through adoption/orphaning.
 	rsList, err := dc.getReplicaSetsForDeployment(d)