Right now these files never go away, and some are a million lines long.
This means splunk eats all the disk IO if we ever restart.

We install the rabbit deb from files.edx.org

I was able to install rabbit and all of its apps at the same
version we have in production without adding the rabbit PPA.

RABBITMQ_CLUSTERED was removed and rabbitmq_clustered_hosts was renamed.

* Create an upstart job that is run after supervisor stops to sync logs
* Syncs trakcing logs before application logs
* stderr and stdout go to /dev/null so we don't fill up root's mailbox

In order to support --check we need to ensure that registered
vars exist before checking their stdout. Otherwise ansible
errors out.

Without the `apt-get update`, the apt cache is out of date while attempting to install
rabbitmq. An older version from the Ubuntu repo is installed instead of the one from
the rabbit repository, which makes the role fail later on with:

```
TASK: [rabbitmq | install plugins] ********************************************
[...]
failed: [10.145.2.22] => {"failed": true, "item": ""}
msg: Failed to find required executable rabbitmq-plugins
```