fix apiextensions reference in controller/clusterauthenticationtrust

Author: eloyekunle

pkg/master/controller/clusterauthenticationtrust/BUILD

@@ -7,7 +7,6 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//staging/src/k8s.io/api/core/v1:go_default_library",
-        "//staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/equality:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",

pkg/master/controller/clusterauthenticationtrust/cluster_authentication_trust_controller.go

@@ -27,7 +27,6 @@ import (
 	"time"
 
 	corev1 "k8s.io/api/core/v1"
-	"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
 	"k8s.io/apimachinery/pkg/api/equality"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -109,7 +108,7 @@ func NewClusterAuthenticationTrustController(requiredAuthenticationData ClusterA
 				return cast.Name == configMapName
 			}
 			if tombstone, ok := obj.(cache.DeletedFinalStateUnknown); ok {
-				if cast, ok := tombstone.Obj.(*apiextensions.CustomResourceDefinition); ok {
+				if cast, ok := tombstone.Obj.(*corev1.ConfigMap); ok {
 					return cast.Name == configMapName
 				}
 			}