Remove debug outputs

test/run-test.py

@@ -25,7 +25,6 @@ shell = (sys.platform == 'win32')
 
 def start_notebook():
     nb_command = [sys.executable, '-m', 'notebook', root_dir, '--no-browser',
-                  '--debug',
                   '--NotebookApp.allow_origin="*"']
     nb_server = subprocess.Popen(nb_command, shell=shell,
                                  stderr=subprocess.STDOUT,