rbd: create token and use it for vault SA

create the token if kubernetes version in
1.24+ and use it for vault sa.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
Signed-off-by: Rakshith R <rar@redhat.com>

internal/util/k8s/version.go

@@ -0,0 +1,45 @@
+/*
+Copyright 2022 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package k8s
+
+import (
+	"fmt"
+	"strconv"
+
+	"k8s.io/client-go/kubernetes"
+)
+
+// GetServerVersion returns kubernetes server major and minor version as
+// integer.
+func GetServerVersion(client *kubernetes.Clientset) (int, int, error) {
+	version, err := client.ServerVersion()
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to get ServerVersion: %w", err)
+	}
+
+	major, err := strconv.Atoi(version.Major)
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to convert Kubernetes major version %q to int: %w", version.Major, err)
+	}
+
+	minor, err := strconv.Atoi(version.Minor)
+	if err != nil {
+		return 0, 0, fmt.Errorf("failed to convert Kubernetes minor version %q to int: %w", version.Minor, err)
+	}
+
+	return major, minor, nil
+}