Expose artifacts options in omnibus package
Related to: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1869
It also creates directory for /artifacts and /lfs-objects.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Related to: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/1869
It also creates directory for /artifacts and /lfs-objects.