Use new MMS monitoring and backup agent packages

For #260.

I left the existing mms_agent recipe in place for now, in case the old tar.gz is still available. The new tar.gz alternative contains only a binary and config file and won't be compatible with mms_agent.

These new recipes pass kitchen on Ubuntu 12.04 and CentOS 6.5, but not the others for various reasons:
- On Ubuntu 10.04 the version of upstart doesn't support `setuid` in the config file
- On Debian 7.2.0 because the package expects upstart to be present but it is not
- On CentOS 5.10 because the package doesn't create the user

On Monday I plan to use these to spin up a real server for our QA environment.

Clearly the two recipes are near duplicates, and so need to be refactored. But I wanted to get this out for initial review.