rbd: check nbd tool features only for rbd driver

calling setRbdNbdToolFeatures inside an init
gets called in main.go for both cephfs and rbd
driver. instead of calling it in init function
calling this in rbd driver.go as this is specific
to rbd.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
(cherry picked from commit dffb6e72c2)

internal/rbd/driver/driver.go

@@ -153,6 +153,8 @@ func (r *Driver) Run(conf *util.Config) {
 			log.FatalLogMsg(err.Error())
 		}
 		rbd.SetGlobalInt("krbdFeatures", krbdFeatures)
+
+		rbd.SetRbdNbdToolFeatures()
 	}
 
 	if conf.IsControllerServer {

internal/rbd/rbd_attach.go

@@ -92,10 +92,6 @@ var (
 	}
 )
 
-func init() {
-	setRbdNbdToolFeatures()
-}
-
 // rbdDeviceInfo strongly typed JSON spec for rbd device list output (of type krbd).
 type rbdDeviceInfo struct {
 	ID             string `json:"id"`
@@ -216,8 +212,9 @@ func waitForPath(ctx context.Context, pool, namespace, image string, maxRetries
 	return "", false
 }
 
-// set features available with rbd-nbd, and NBD module loaded status.
-func setRbdNbdToolFeatures() {
+// SetRbdNbdToolFeatures sets features available with rbd-nbd, and NBD module
+// loaded status.
+func SetRbdNbdToolFeatures() {
 	var stderr string
 	// check if the module is loaded or compiled in
 	_, err := os.Stat(fmt.Sprintf("/sys/module/%s", moduleNbd))