fix recursive directory search

src/python/dm/common/utility/osUtility.py

@@ -86,7 +86,7 @@ class OsUtility:
                 if os.path.isfile(fullPath):
                     fList.append(fullPath)
                 elif os.path.isdir(fullPath):
-                    fList = findFiles(fullPath, fList)
+                    fList = cls.findFiles(fullPath, fList)
         return fList
 
     @classmethod