Replace nginx callbacks with more robust solution

[ChrisSchinnerl]

We might need a more robust solution for notifying our services such as accounts, malware-scanner and the pinner than nginx callbacks since we are running out of timers in nginx.

One proposed option was delegating the responsibility of updating the services to a service that scans through the access logs.

We should do some more research on why we are running out of timers and whether there is a better solution.