[CE] Backport Identity.uniqueness_scope from EE (!18689) · Merge requests · GitLab.org / GitLab FOSS · GitLab

James Edwards-Jones requested to merge ce-jej/identity-relates-to-saml into master May 02, 2018

What does this MR do?

Backports changes from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5507

Acceptance Criteria

Review
- Has been reviewed by Backend
End-to-end tests pass (package-and-qa manual pipeline job)