Keeping iids number for stable branch
Created by: hiroponz
Renumbering iids breaks GitLab references in GFM. Fixes #5179 (closed)
Summary
- Keep issues, merge requests and milestones number when updating GitLab 6.1.
- Issues, merge requests and milestones number increments per projects after updating GitLab 6.1.
- Issues, merge requests and milestones number begin from one at new project.