Some cleanup after feedback.

* From #puppet, FriedBob suggested moving `examples.pp` into `tests/`:

        FriedBob>
        ojacobson: "example.pp" shoudl probably be "tests/site.pp"

        ojacobson>
        FriedBob: that would imply that I have any strong assertions about its
        final state ;)

        FriedBob>
        ojacobson: tests/* is just used for smoke tests, not anythign real
        major

* From my day job's #devops channel, Marvin asked about the use of absolute
  paths to `rabbitmqctl`:

        Marvin>
        Would there be any scenario where rabbitmqctl wouldn't be installed in
        this location: rabbitmqctl => '/usr/sbin/rabbitmqctl'

        Owen>
        Not that I've seen.

        Marvin>
        Just wondering if that would be worth setting in a config or something
        (just a thought)

        Owen>
        Puppet's command-glue will absoluteify relative paths in commands,
        though, so I could probably use the short name and rely on $PATH

* I spotted a stray `Puppet.warning` call left over from debugging.