WaitlistWorker never shuts down

[m-linner-ericsson]

Description

The WaitlistWorker thread does not have an interface to receive shutdown signals and App.java never tells it to shut down. During tests, we notice this as it tries to connect to MongoDB after MongoDB has shut down.

App.java or someone else should halt the thread when it receives a shutdown signal.

Motivation

Lessen the amount to error logged during tests

Exemplification

Benefits

Less errors during testing

Possible Drawbacks

[henning-roos]

Look into the order spring closes down.