e2e: rework on E2E framework

rework of E2E framework for better code
organization and add more helpful logs for
debugging.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

e2e/namespace.go

@@ -0,0 +1,75 @@
+package e2e
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"strings"
+	"time"
+
+	v1 "k8s.io/api/core/v1"
+	apierrs "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/wait"
+	"k8s.io/client-go/kubernetes"
+	e2elog "k8s.io/kubernetes/test/e2e/framework/log"
+	testutils "k8s.io/kubernetes/test/utils"
+)
+
+func createNamespace(c kubernetes.Interface, name string) error {
+	timeout := time.Duration(deployTimeout) * time.Minute
+	ns := &v1.Namespace{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: name,
+		},
+	}
+	_, err := c.CoreV1().Namespaces().Create(context.TODO(), ns, metav1.CreateOptions{})
+	if err != nil && !apierrs.IsAlreadyExists(err) {
+		return err
+	}
+
+	return wait.PollImmediate(poll, timeout, func() (bool, error) {
+		_, err := c.CoreV1().Namespaces().Get(context.TODO(), name, metav1.GetOptions{})
+		if err != nil {
+			e2elog.Logf("Error getting namespace: '%s': %v", name, err)
+			if apierrs.IsNotFound(err) {
+				return false, nil
+			}
+			if testutils.IsRetryableAPIError(err) {
+				return false, nil
+			}
+			return false, err
+		}
+		return true, nil
+	})
+}
+
+func deleteNamespace(c kubernetes.Interface, name string) error {
+	timeout := time.Duration(deployTimeout) * time.Minute
+	err := c.CoreV1().Namespaces().Delete(context.TODO(), name, metav1.DeleteOptions{})
+	if err != nil && !apierrs.IsNotFound(err) {
+		return err
+	}
+	return wait.PollImmediate(poll, timeout, func() (bool, error) {
+		_, err = c.CoreV1().Namespaces().Get(context.TODO(), name, metav1.GetOptions{})
+		if err != nil {
+			if apierrs.IsNotFound(err) {
+				return true, nil
+			}
+			e2elog.Logf("Error getting namespace: '%s': %v", name, err)
+			if testutils.IsRetryableAPIError(err) {
+				return false, nil
+			}
+			return false, err
+		}
+		return false, nil
+	})
+}
+
+func replaceNamespaceInTemplate(filePath string) (string, error) {
+	read, err := ioutil.ReadFile(filePath)
+	if err != nil {
+		return "", err
+	}
+	return strings.ReplaceAll(string(read), "namespace: default", fmt.Sprintf("namespace: %s", cephCSINamespace)), nil
+}