refact(csi): use common lib-csi imports (#263)

Signed-off-by: shubham <shubham.bajpai@mayadata.io>

vendor/github.com/openebs/lib-csi/pkg/client/k8s/configmap.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2020 The OpenEBS 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 (
+	"strings"
+
+	"github.com/pkg/errors"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// ConfigMapGetter abstracts fetching of ConfigMap instance from kubernetes
+// cluster
+type ConfigMapGetter interface {
+	Get(options metav1.GetOptions) (*corev1.ConfigMap, error)
+}
+
+// Configmap is used to initialise a kubernetes Configmap struct
+type Configmap struct {
+	namespace string // namespace where this configmap exists
+	name      string // name of this configmap
+}
+
+// ConfigMap returns a new instance of configmap
+func ConfigMap(namespace, name string) *Configmap {
+	return &Configmap{namespace: namespace, name: name}
+}
+
+// Get returns configmap instance from kubernetes cluster
+func (c *Configmap) Get(options metav1.GetOptions) (cm *corev1.ConfigMap, err error) {
+	if len(strings.TrimSpace(c.name)) == 0 {
+		return nil, errors.Errorf("missing config map name: failed to get config map from namespace %s", c.namespace)
+	}
+	cs, err := Clientset().Get()
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to get config map %s %s", c.namespace, c.name)
+	}
+	return cs.CoreV1().ConfigMaps(c.namespace).Get(c.name, options)
+}