cinder-csi-plugin: Trivial variable rename

To clarify their meaning.

Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

pkg/csi/cinder/controllerserver.go

@@ -121,7 +121,7 @@ func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
 	}
 
 	// Volume Create
-	properties := map[string]string{cinderCSIClusterIDKey: cs.Driver.cluster}
+	properties := map[string]string{cinderCSIClusterIDKey: cs.Driver.clusterID}
 	//Tag volume with metadata if present: https://github.com/kubernetes-csi/external-provisioner/pull/399
 	for _, mKey := range sharedcsi.RecognizedCSIProvisionerParams {
 		if v, ok := req.Parameters[mKey]; ok {
@@ -764,7 +764,7 @@ func (cs *controllerServer) createSnapshot(cloud openstack.IOpenStack, name stri
 	}
 
 	// Add cluster ID to the snapshot metadata
-	properties := map[string]string{cinderCSIClusterIDKey: cs.Driver.cluster}
+	properties := map[string]string{cinderCSIClusterIDKey: cs.Driver.clusterID}
 
 	// see https://github.com/kubernetes-csi/external-snapshotter/pull/375/
 	// Also, we don't want to tag every param but we still want to send the
@@ -790,7 +790,7 @@ func (cs *controllerServer) createSnapshot(cloud openstack.IOpenStack, name stri
 
 func (cs *controllerServer) createBackup(cloud openstack.IOpenStack, name string, volumeID string, snap *snapshots.Snapshot, parameters map[string]string) (*backups.Backup, error) {
 	// Add cluster ID to the snapshot metadata
-	properties := map[string]string{cinderCSIClusterIDKey: cs.Driver.cluster}
+	properties := map[string]string{cinderCSIClusterIDKey: cs.Driver.clusterID}
 
 	// see https://github.com/kubernetes-csi/external-snapshotter/pull/375/
 	// Also, we don't want to tag every param but we still want to send the

pkg/csi/cinder/driver.go

@@ -66,16 +66,17 @@ type Driver struct {
 	name      string
 	fqVersion string //Fully qualified version in format {Version}@{CPO version}
 	endpoint  string
-	cluster   string
+	clusterID string
 
-	ids       *identityServer
-	cs        *controllerServer
-	ns        *nodeServer
-	pvcLister v1.PersistentVolumeClaimLister
+	ids *identityServer
+	cs  *controllerServer
+	ns  *nodeServer
 
 	vcap  []*csi.VolumeCapability_AccessMode
 	cscap []*csi.ControllerServiceCapability
 	nscap []*csi.NodeServiceCapability
+
+	pvcLister v1.PersistentVolumeClaimLister
 }
 
 type DriverOpts struct {
@@ -89,7 +90,7 @@ func NewDriver(o *DriverOpts) *Driver {
 		name:      driverName,
 		fqVersion: fmt.Sprintf("%s@%s", Version, version.Version),
 		endpoint:  o.Endpoint,
-		cluster:   o.ClusterID,
+		clusterID: o.ClusterID,
 		pvcLister: o.PVCLister,
 	}