Set rabbitmq's port and IP via the config file and not the env file

Set rabbitmq's port and IP via the config file and not the env file

The RabbitMQ's puppet manifest configures the node's IP and port through
environment variables. While this would usually be fine, it doesn't
allow us to use TLS-only, since it will always try to start a TCP
listener. So, by setting these values through the config file, when
setting ssl_only for rabbitmq, they will effectively be discarded and
thus allow us to use an SSL listener on the same port.

Change-Id: I33d051a8c740baf69b99517378e1f9b0f3cc1681