Make unicorn listen on localhost, not 127.0.0.1
Make unicorn listen on localhost, not 127.0.0.1

In rare occasions, localhost isn't 127.0.0.1 (eg on the vagrant VM for
ci-master-1, localhost is 127.0.1.1). In this case, the nginx config
doesn't match where unicorn is listening, and therefore things don't
work. Setting both to localhost fixes this.

alphagov/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet,alphagov/ci-puppet