No notifications if initialization fails

[zfi]

Related to issue #54

The supervisor service does not mount the cloud-session app if the app fails to initialize. This is expected, but it would be a good thing for a notification to be generated and/or a more robust initialization scheme deployed to do something more that just die silently.

sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2002, "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)") (Background on this error at: http://sqlalche.me/e/e3q8)
unable to load app 0 (mountpoint='') (callable not found or import error)
*** no app loaded. going in full dynamic mode ***
*** uWSGI is running in multiple interpreter mode ***