Revert "Merge branch 'rs-update-rubocop-rspec' into 'master'"
Reverts https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6357 due to rubocop-rspec dropping support for Ruby 2.1.
Reverts https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6357 due to rubocop-rspec dropping support for Ruby 2.1.