Comment 1 for bug 1649412

Reviewed: https://review.openstack.org/409946
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=e3f55e7b54250f46f8ade623fe9d62586cf780be
Submitter: Jenkins
Branch: master

commit e3f55e7b54250f46f8ade623fe9d62586cf780be
Author: Ronald De Rose <email address hidden>
Date: Mon Dec 12 21:46:27 2016 +0000

    Make user to nonlocal_user a 1:1 relationship

    The table relationship between 'user' and 'nonlocal_user' should be
    1 to 1, which is consistent with 'user' to 'local_user'. However, it's
    mistakenly 1 to many. In fact, the backend code treats 'user' to
    'nonlocal_user' as 1:1 and wouldn't allow duplicates, so this will have
    zero impact on existing deployments. This patch fixes this by making the
    user_id column unique.

    Closes-Bug: #1649412
    Partially-Implements: bp support-federated-attr
    Change-Id: Ib371df18f3fb2c67e5421cf0bf4551183902cf00