updates to syncing s3 logs and cron jobs

* 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
The sync script does a
```
exec > >(tee "{{ aws_s3_logfile }}")
exec 2>&1
```
so everything is already logged.

I made the change to rabbitmq since it's really noisy with a `set -x` and is spamming root's mailbox.