Merge pull request #48976 from supereagle/cleanup-api-package

Automatic merge from submit-queue (batch tested with PRs 48976, 49474, 40050, 49426, 49430)

Remove duplicated import and wrong alias name of api package

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

**Which issue this PR fixes**: fixes #48975

**Special notes for your reviewer**:
/assign @caesarxuchao

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

pkg/controller/statefulset/stateful_set.go

@@ -23,7 +23,6 @@ import (
 
 	apps "k8s.io/api/apps/v1beta1"
 	"k8s.io/api/core/v1"
-	clientv1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
@@ -88,7 +87,7 @@ func NewStatefulSetController(
 	eventBroadcaster := record.NewBroadcaster()
 	eventBroadcaster.StartLogging(glog.Infof)
 	eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: v1core.New(kubeClient.Core().RESTClient()).Events("")})
-	recorder := eventBroadcaster.NewRecorder(scheme.Scheme, clientv1.EventSource{Component: "statefulset"})
+	recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "statefulset"})
 
 	ssc := &StatefulSetController{
 		kubeClient: kubeClient,