Follow kubernetes APIs directory structure (#1497)

cmd/preupgradechecks/preupgradechecks.go

@@ -27,7 +27,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 
-	fv1 "github.com/fission/fission/pkg/apis/fission.io/v1"
+	fv1 "github.com/fission/fission/pkg/apis/core/v1"
 	"github.com/fission/fission/pkg/crd"
 	"github.com/fission/fission/pkg/utils"
 )
@@ -89,7 +89,7 @@ func (client *PreUpgradeTaskClient) VerifyFunctionSpecReferences() {
 	var fList *fv1.FunctionList
 
 	for i := 0; i < maxRetries; i++ {
-		fList, err = client.fissionClient.V1().Functions(metav1.NamespaceAll).List(metav1.ListOptions{})
+		fList, err = client.fissionClient.CoreV1().Functions(metav1.NamespaceAll).List(metav1.ListOptions{})
 		if err == nil {
 			break
 		}
@@ -167,12 +167,12 @@ func (client *PreUpgradeTaskClient) RemoveClusterAdminRolesForFissionSAs() {
 // This is because, we just deleted the ClusterRoleBindings for these service accounts in the previous function and
 // for the existing functions to work, we need to give these SAs the right privileges
 func (client *PreUpgradeTaskClient) NeedRoleBindings() bool {
-	pkgList, err := client.fissionClient.V1().Packages(metav1.NamespaceDefault).List(metav1.ListOptions{})
+	pkgList, err := client.fissionClient.CoreV1().Packages(metav1.NamespaceDefault).List(metav1.ListOptions{})
 	if err == nil && len(pkgList.Items) > 0 {
 		return true
 	}
 
-	fnList, err := client.fissionClient.V1().Functions(metav1.NamespaceDefault).List(metav1.ListOptions{})
+	fnList, err := client.fissionClient.CoreV1().Functions(metav1.NamespaceDefault).List(metav1.ListOptions{})
 	if err == nil && len(fnList.Items) > 0 {
 		return true
 	}