Use MetadataGenerator instead of deprecated MetaGenerator

Related to #17133718.

sobjects.py

@@ -215,7 +215,7 @@ def import_skos_extentities(cnx, entities, import_log,
     # metagenerator to properly set the source for created entities
     if store is None:
         if metagenerator is None:
-            metagenerator = dataimport.MetaGenerator(cnx, source=source)
+            metagenerator = dataimport.MetadataGenerator(cnx, source=source)
         store = dataimport.NoHookRQLObjectStore(cnx, metagenerator)
     else:
         assert metagenerator is None, 'you should not give both a store and a metadata generator'