Unresponsive connections should not make producers unresponsive

The text has:

```
6. Remove the toxic from the proxy
docker/toxiproxy-cli toxic remove --toxicName timeout_upstream rabbit
Removed toxic 'timeout_upstream' on proxy 'rabbit'
```

but I had to remove 'timeout_downstream' as well to get it to work.  I didn't try to validate whether just removing timeout_downstream would have worked. 