Work around deadlocks in test

Multiple threads are trying to use the single thread pool causing deadlocks
when I try to run tests. @danielnorberg was able to track down the issue
and this gets it working on my machine.
Adjust timeout to pass on my machine

This was 5000ms which apparently my laptop can’t handle. Adjusting it higher got the test to pass. 30000 didn’t work, so I’ll give it a minute.
Merge pull request #69 from spotify/philipcristiano/fix-timeouts

Work around deadlocks in test