Merge request widget replace body & footer
EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8697
Also brings https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1091 to master
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8697
Also brings https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1091 to master