Fix unittest

Author: reyoung

paddle/scripts/docker/jupyter_notebook_config.py

@@ -23,5 +23,5 @@
 
 # sets a password if PASSWORD is set in the environment
 if 'PASSWORD' in os.environ:
-  c.NotebookApp.password = passwd(os.environ['PASSWORD'])
-  del os.environ['PASSWORD']
+    c.NotebookApp.password = passwd(os.environ['PASSWORD'])
+    del os.environ['PASSWORD']