Updates specs to use new rails5 format. The old format: `get :show, { some: params }, { some: headers }` The new format: `get :show, params: { some: params }, headers: { some: headers }`
This new endpoint allow users to update a submodule's reference. The MR involves adding a new operation RPC operation in gitaly-proto (see gitlab-org/gitaly-proto!233) and change Gitaly to use this new version (see gitlab-org/gitaly!936). See gitlab-org/gitlab-ce!20949