Minor typo in dbbase.py

Change-Id: I493c60e18a4f0d33875b2d185e1a11f1d0dbd762
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/osm_common/dbbase.py b/osm_common/dbbase.py
index d0d4fb0..4127aa8 100644
--- a/osm_common/dbbase.py
+++ b/osm_common/dbbase.py
@@ -74,7 +74,7 @@
             user:   database username
             password:   database password
             commonkey: common OSM key used for sensible information encryption
-            materpassword: same as commonkey, for backward compatibility. Deprecated, to be removed in the future
+            masterpassword: same as commonkey, for backward compatibility. Deprecated, to be removed in the future
         :param target_version: if provided it checks if database contains required version, raising exception otherwise.
         :return: None or raises DbException on error
         """