Comment 6 for bug 1880753

Reviewed: https://review.opendev.org/735617
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=55c0787d00d678b2fbfc9e99a6e4b4ce5c9a82ca
Submitter: Zuul
Branch: master

commit 55c0787d00d678b2fbfc9e99a6e4b4ce5c9a82ca
Author: Mark Goddard <email address hidden>
Date: Mon Jun 15 16:19:49 2020 +0100

    Remove max count from Cinder online schema migration

    During an upgrade from Stein to Train, Kolla Ansible fails while running
    TASK [cinder : Running Cinder online schema migration]

    This is because the `--max_count 10` option is used, which returns 1
    while migrations are processed. According to the upgrade documentation,
    the command should be rerun while the exit status is 1:
    https://docs.openstack.org/cinder/train/upgrade.html

    This issue was introduced by a change to the image [1] which fixed a bug
    in the way that the max count was interpreted, but exposed an issue in
    using the max count.

    This change fixes the issue by ceasing to pass MAX_NUMBER, which will
    cause all migrations to occur in a single pass.

    [1] https://review.opendev.org/#/c/712055

    Change-Id: Ia786d037f5484f18294188639c956d4ed5ffbc2a
    Closes-Bug: #1880753