remove port 8080 from gitlab-hq-config.yml as it binds to a unix socket ...

...(via puma) not to this port

This PR removes port 8080 from the gitlab.yml config. Since the gitlab service does not bind to this port it's just confusing, so we better remove it.

I initially intended to make the nginx port configurable as well, but won't do it because this will be fixed automatically once we resolve vogelb/cookbooks-gitlab#3