Revert "Merge branch 'disable-rack-attack-throttling' into 'master'"
This reverts merge request !295 (merged).
https://gitlab.com/gitlab-org/gitlab/merge_requests/19185 should fix the root cause of this particular issue (disables Rack attack by default), while https://gitlab.com/gitlab-org/gitlab/merge_requests/19184 restores the previous behavior of rate limiting only POST requests.