Changes to rabbitmq settings in Automate optional settings docs

[teknofire]

The docs at https://docs.chef.io/config_rb_delivery_optional_settings.html#rabbitmq are out of date with some changes made 6 months ago.

This PR https://github.com/chef/automate/commit/de3056317161cb9c0c4d0dc9228519f7bf5fd588 made the following changes:

1. defaults for rabbitmq['node_ip_address'] has changed from 0.0.0.0 to 127.0.0.1
2. a new config option was added for rabbitmq['management_listen_address'] which defaults to 127.0.0.1

[teknofire]

These config options for rabbitmq are also missing

rabbitmq['ssl_certificate'] = '/path/to/rabbitmq.crt'
rabbitmq['ssl_certificate_key'] = '/path/to/rabbitmq.key'

[IanMadd]

Issue about feature that is EOL as of 2021