The --config option with absolute paths will be loaded only once. (#923)

Co-authored-by: Min RK <[email protected]>

Author: qraqras

traitlets/config/application.py

@@ -899,6 +899,8 @@ def _load_config_files(
 
         yield each config object in turn.
         """
+        if os.path.isabs(basefilename):
+            path = [None]
         if isinstance(path, str) or path is None:
             path = [path]
         for current in reversed(path):