DB Port is Redis port

I am pretty sure this is a bug. Hopefully someone can shed some light on it.

https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab/attributes/default.rb#L110 seems to use the default Redis port rather than the Postgres port. Postgres is set to listen on the port defined at https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab/attributes/default.rb#L158 unless overridden.