Update ns.py to consider changes in common versioning

Change-Id: I6fa1bd806fda9b049c40f3d5eabb405845b8421b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/NG-RO/osm_ng_ro/ns.py b/NG-RO/osm_ng_ro/ns.py
index 9e5e190..995ad5b 100644
--- a/NG-RO/osm_ng_ro/ns.py
+++ b/NG-RO/osm_ng_ro/ns.py
@@ -39,13 +39,13 @@
     UndefinedError,
 )
 from osm_common import (
+    _version as common_version,
     dbmemory,
     dbmongo,
     fslocal,
     fsmongo,
     msgkafka,
     msglocal,
-    version as common_version,
 )
 from osm_common.dbbase import DbBase, DbException
 from osm_common.fsbase import FsBase, FsException