reflect linter feedback, remove unused argumnents and redundant type from arrays (#2739)

* reflect linter feedback, remove unused argumnents and redundant literal definitions
* add logical backup to TestCreate unit test

pkg/util/k8sutil/k8sutil.go

@@ -7,8 +7,6 @@ import (
 	b64 "encoding/base64"
 	"encoding/json"
 
-	clientbatchv1 "k8s.io/client-go/kubernetes/typed/batch/v1"
-
 	apiacidv1 "github.com/zalando/postgres-operator/pkg/apis/acid.zalan.do/v1"
 	zalandoclient "github.com/zalando/postgres-operator/pkg/generated/clientset/versioned"
 	acidv1 "github.com/zalando/postgres-operator/pkg/generated/clientset/versioned/typed/acid.zalan.do/v1"
@@ -24,6 +22,7 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/kubernetes"
 	appsv1 "k8s.io/client-go/kubernetes/typed/apps/v1"
+	batchv1 "k8s.io/client-go/kubernetes/typed/batch/v1"
 	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
 	policyv1 "k8s.io/client-go/kubernetes/typed/policy/v1"
 	rbacv1 "k8s.io/client-go/kubernetes/typed/rbac/v1"
@@ -59,9 +58,9 @@ type KubernetesClient struct {
 	appsv1.StatefulSetsGetter
 	appsv1.DeploymentsGetter
 	rbacv1.RoleBindingsGetter
+	batchv1.CronJobsGetter
 	policyv1.PodDisruptionBudgetsGetter
 	apiextv1client.CustomResourceDefinitionsGetter
-	clientbatchv1.CronJobsGetter
 	acidv1.OperatorConfigurationsGetter
 	acidv1.PostgresTeamsGetter
 	acidv1.PostgresqlsGetter
@@ -373,7 +372,7 @@ func (mock *mockDeployment) Get(ctx context.Context, name string, opts metav1.Ge
 			Template: v1.PodTemplateSpec{
 				Spec: v1.PodSpec{
 					Containers: []v1.Container{
-						v1.Container{
+						{
 							Image: "pooler:1.0",
 						},
 					},