Comment 8 for bug 1390397

Reviewed: https://review.openstack.org/136848
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=15106db883857ed982823421af03f6983ac82869
Submitter: Jenkins
Branch: master

commit 15106db883857ed982823421af03f6983ac82869
Author: Dima Shulyak <email address hidden>
Date: Tue Nov 25 16:22:30 2014 +0200

    Persist primary roles in nailgun database

    Currently we have a problem, when new controller added
    with lower uid than already deployed controller.
    In this case primary-controller will be assigned to new one,
    but we already have existing controller which will conflict with
    new one.

    To overcome this issue primary role will be persisted in
    database.
    - Added primary attribute for pending_roles and roles tables
      by default primary will be False, it will be replaced only
      by special Cluster.set_primary_roles procedure
    - primary flag wont migrate from roles to pending roles,
      because such migration means that node was reseted to bootstrap
    - Primary roles used in logic of primary prefix assignment
    - For roles that should have primary - has_primary: true
      should be added in openstack.yaml

    TBD:
    - migration from pending roles to roles, currently it is covered
      by deployment logic, but maybe there is some cases where we want to do
      it explicitly

    Closes-Bug: 1390397
    Change-Id: I94b0014e9b4e16b2f8f0f6b9a092effb116a33ea