Domains commands aren't aware of SSL Endpoints

[xavriley]

The message output by domains:add covers the default case but is very confusing for customers who need to use the SSL Endpoint add-on for whatever reason (usually PCI compliance, custom TLS versions, custom ciphers or legacy browser support).

 Configure your app's DNS provider to point to the DNS Target
 ▸    cloudsense.com.herokudns.com

Ideally, the command would check for the presence of an SSL Endpoint add-on and show that as an option. I'll try to put in a PR for this if I have time. Example ticket: https://support.heroku.com/tickets/563512?t=1521125689