Initialize Flask application
Summary:
The notifications center's delivery API will listen to /delivery.
We initialize a Flask application with a /delivery/status 200 alive
reply to let monitoring tool and production environment tests check
if the application is up.
This commit has been done in the Francfort-Bruxelles ICE, with wifi aboard.
Test Plan:
- Run it through ./app.py
- Browse /, get a 4O4
- Browse /delivery/status, get a 200 ALIVE
Reviewers: dereckson
Reviewed By: dereckson
Differential Revision: https://devcentral.nasqueron.org/D986