Unable to disable port 5984 when using SSL / https

## Description

It should be possible to configure CouchDB to serve documents only over an SSL port (default: 6984) and not the insecure http port (defautl: 5984).

## Steps to Reproduce

_n/a_

## Expected Behaviour

CouchDB only binds to port 6984 with the httpsd daemon.

## Your Environment

* CouchDB Version used: `master`

## Additional context

This is a common request, and something we lost when we made security settings changes in 2.3.1, since it is no longer possible to disable the daemon via `[daemons]`.

Start by tracing how the [daemons] configuration and the httpd and httpsd entry points are handled after the 2.3.1 security settings changes. Check the existing configuration and daemon tests before determining how disabling the insecure daemon should be represented. Done means CouchDB binds only to the configured SSL port while the HTTP port remains disabled.

Written by the indexing model from the issue text.