[cinder-csi-plugin] Remove the pods-cloud-data volume (kubernetes#1182)

pods-cloud-data volume is no longer used, removing the mount

Author: ramineni

manifests/cinder-csi-plugin/cinder-csi-nodeplugin.yaml

@@ -70,9 +70,6 @@ spec:
             - name: kubelet-dir
               mountPath: /var/lib/kubelet
               mountPropagation: "Bidirectional"
-            - name: pods-cloud-data
-              mountPath: /var/lib/cloud/data
-              readOnly: true
             - name: pods-probe-dir
               mountPath: /dev
               mountPropagation: "HostToContainer"
@@ -92,10 +89,6 @@ spec:
           hostPath:
             path: /var/lib/kubelet
             type: Directory
-        - name: pods-cloud-data
-          hostPath:
-            path: /var/lib/cloud/data
-            type: Directory
         - name: pods-probe-dir
           hostPath:
             path: /dev

pkg/util/mount/mount.go

@@ -39,7 +39,6 @@ const (
 	operationFinishInitDelay = 1 * time.Second
 	operationFinishFactor    = 1.1
 	operationFinishSteps     = 15
-	instanceIDFile           = "/var/lib/cloud/data/instance-id"
 )
 
 type IMount interface {