Unit test running in REPL did not clean up resources and used up all disk space

[nsinkov]

After running unit tests in waiter/test/waiter/scheduler/composite_test.clj using the REPL in Intellij, some process kept logging to waiter/log/waiter.log.2018-10-18 until all disk space was used up

tail of waiter/log/waiter.log:

...
2018-10-19 09:47:51,751 INFO  waiter.scheduler.composite [async-dispatch-17] -  sending 0 services along scheduler-state-chan
2018-10-19 09:47:51,751 INFO  waiter.scheduler.composite [async-dispatch-17] -  ipsum state chan has been closed
2018-10-19 09:47:51,751 INFO  waiter.scheduler.composite [async-dispatch-17] -  sending 0 services along scheduler-state-chan
2018-10-19 09:47:51,751 INFO  waiter.scheduler.composite [async-dispatch-17] -  ipsum state chan has been closed
...