Avoid hardcoding secret, not even a placeholder

Author: rayluo

sample/authorization-code-flow-sample/authorization_code_flow_sample.py

@@ -29,7 +29,7 @@
 
 app = flask.Flask(__name__)
 app.debug = True
-app.secret_key = 'development'
+app.secret_key = sys.argv[2]  # In this demo, we expect a secret from 2nd CLI param
 
 
 # Optional logging