Revisit database rolling upgrade documentation

[Abhishek Kekane]

Since db_sync is now internally using EMC pattern we need to revisit the entire database rolling upgrades documentation.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/546172

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/546172
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=d500b3f883e94a3b82f313bffe6dbeb08d7ee1e4
Submitter: Zuul
Branch: master

commit d500b3f883e94a3b82f313bffe6dbeb08d7ee1e4
Author: Abhishek Kekane <email address hidden>
Date: Tue Feb 20 14:47:43 2018 +0000

    Revise database rolling upgrade documentation

    - mark zero-downtime-db-upgrade as EXPERIMENTAL for queens
    - clarify the relation between the E-M-C strategy and
      zero-downtime db upgrades
    - add note that for MySQL, using the glance-manage expand or
      glance-manage contract command requires that the glance
      is granted SUPER privileges
    - add note to contributor docs about checking the trigger
      flag in expand and contract scripts

    Co-authored-by: Abhishek Kekane <email address hidden>
    Co-authored-by: Brian Rosmaita <email address hidden>

    Change-Id: I5af4a1428b89ecb05a1be9c420c5f0afc05b9a95
    Closes-Bug: #1750555

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/queens
Review: https://review.openstack.org/546605

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/546605
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=280d98b1bab8dc771c117a4bb0c3474fa36172d1
Submitter: Zuul
Branch: stable/queens

commit 280d98b1bab8dc771c117a4bb0c3474fa36172d1
Author: Abhishek Kekane <email address hidden>
Date: Tue Feb 20 14:47:43 2018 +0000

    Revise database rolling upgrade documentation

    - mark zero-downtime-db-upgrade as EXPERIMENTAL for queens
    - clarify the relation between the E-M-C strategy and
      zero-downtime db upgrades
    - add note that for MySQL, using the glance-manage expand or
      glance-manage contract command requires that the glance
      is granted SUPER privileges
    - add note to contributor docs about checking the trigger
      flag in expand and contract scripts

    Co-authored-by: Abhishek Kekane <email address hidden>
    Co-authored-by: Brian Rosmaita <email address hidden>

    Change-Id: I5af4a1428b89ecb05a1be9c420c5f0afc05b9a95
    Closes-Bug: #1750555
    (cherry picked from commit d500b3f883e94a3b82f313bffe6dbeb08d7ee1e4)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/glance 16.0.0.0rc3 release candidate.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/glance 17.0.0.0b1 development milestone.