rbd: updated node labels fetching logic

node labels are fetched only if controller is running in k8s and is nodeserver

Signed-off-by: Jan Nemcik <jan.nemcik@solargis.com>
(cherry picked from commit 3443546)

internal/rbd/driver/driver.go

@@ -125,7 +125,7 @@ func (r *Driver) Run(conf *util.Config) {
 			})
 	}
 
-	if k8s.RunsOnKubernetes() {
+	if k8s.RunsOnKubernetes() && conf.IsNodeServer {
 		nodeLabels, err = k8s.GetNodeLabels(conf.NodeID)
 		if err != nil {
 			log.FatalLogMsg(err.Error())