[EE] Improve the Project factory to make `creator` defaults to `namespace.owner`
What does this MR do?
EE MR for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13412
Are there points in the code the reviewer needs to double check?
I've moved some EE-specific examples to their right place.
Why was this MR needed?
Because, even if no conflicts were detected for the CE MR, specs would fail once failed into EE.