Dedicated method for counting commits between refs
Corresponding gitlab_git merge request: https://gitlab.com/gitlab-org/gitlab_git/merge_requests/66 Issue that lead to these changes: https://gitlab.com/gitlab-org/gitlab-ce/issues/12619
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Corresponding gitlab_git merge request: https://gitlab.com/gitlab-org/gitlab_git/merge_requests/66 Issue that lead to these changes: https://gitlab.com/gitlab-org/gitlab-ce/issues/12619