fix rabbitmq ssl config

[patrick-minted]

The intent, per the comments in the module, is that $sensu::rabbitmq_ssl
would be set to true if you set either a certificate or a key. That var
defaults to false. Current code does not actually override this value.
When the sensu_rabbitmq_config is called, it directly references this var,
so unless you've specifically set it in your config, it's always false.
This makes it behave the way the module comments describe.

[patrick-minted]

I opened this before I had actually tested it. I've now verified it works, but it also adds a requirement for an update to erlang, which I solved in my setup by adding the 'garethr-erlang' module from the forge and ensuring it installs before rabbitmq. That fix is specific for Ubuntu, but the nice thing about adding in that module is it covers several OS bases. Without it you get the stock erlang-nox package, which has a vulnerability. Rabbitmq-server will disable ssl without a patched version of erlang-nox.

I'm not sure how you all would like to address the dependency in your repo (or if you just want to add it to the docs...)

edit: the requirement only applies if you want to use ssl with rabbitmq.

[jlambert121]

Thanks @patrick-minted. I think managing erlang is outside the scope of this module, but should be managed closer to the actual rabbitmq install.