remove duplicated import and wrong alias name of api package

pkg/proxy/iptables/proxier.go

@@ -35,7 +35,7 @@ import (
 
 	"github.com/golang/glog"
 
-	clientv1 "k8s.io/api/core/v1"
+	"k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
@@ -1235,7 +1235,7 @@ func (proxier *Proxier) syncProxyRules() {
 						msg := fmt.Sprintf("can't open %s, skipping this externalIP: %v", lp.String(), err)
 
 						proxier.recorder.Eventf(
-							&clientv1.ObjectReference{
+							&v1.ObjectReference{
 								Kind:      "Node",
 								Name:      proxier.hostname,
 								UID:       types.UID(proxier.hostname),