Comment 22 for bug 1865754

Reviewed: https://review.opendev.org/751246
Committed: https://git.openstack.org/cgit/openstack/os-brick/commit/?id=91c73a433a2b3675e661f1fe007b58c2bfaff757
Submitter: Zuul
Branch: stable/ussuri

commit 91c73a433a2b3675e661f1fe007b58c2bfaff757
Author: Brian Rosmaita <email address hidden>
Date: Tue Sep 8 11:44:25 2020 -0400

    New fix for rbd connector to work with ceph octopus

    Found while testing cinder-backup with ceph on Ubuntu Focal, which
    installs ceph Octopus. Octopus apparently enforces the requirement
    that the config file contain a '[global]' section for general
    requirements. The '[global]' section goes back at least to ceph
    Hammer [0], so we will simply add it to the temporary ceph config
    file that os-brick generates in the RBDConnector class.

    [0] https://docs.ceph.com/docs/hammer/rados/configuration/mon-config-ref/

    Co-authored-by: Alex Kavanagh <email address hidden>
    Co-authored-by: Ivan Kolodyazhny <email address hidden>

    Change-Id: I86eb31535d990291945de5d9846b1a03157ec2cf
    Closes-bug: #1865754
    (cherry picked from commit c6ad4d864c6088b6686919dd0229c926bce7073a)
    (cherry picked from commit 474583b4f8469f7957d6ffbf62829b516189aeae)