Fix project factory `import_*` traits
Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/5904
Reverts changes to spec/factories/projects.rb
made in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18688/diffs.
Edited by Douwe Maan
Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/5904
Reverts changes to spec/factories/projects.rb
made in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18688/diffs.