Comment 2 for bug 1665272

Reviewed: https://review.openstack.org/435459
Committed: https://git.openstack.org/cgit/openstack/charm-cinder/commit/?id=8641e81498dce5a7fa2b42bb48aa9655c5df7d04
Submitter: Jenkins
Branch: master

commit 8641e81498dce5a7fa2b42bb48aa9655c5df7d04
Author: Liam Young <email address hidden>
Date: Thu Feb 16 12:13:03 2017 +0000

    Move backends into their own sections

    Using DEFAULT section to configure drivers is not supported since
    Ocata. This change lists backends in enabled_backends.

    Note: Using sectional config causes the os-vol-host-attr:host
    volume attribute to change which invalidates existing volumes.
    A subsequant change is needed to add an action for renaming
    the host attribute of existing volumes *1

    *1 https://docs.openstack.org/admin-guide/blockstorage-multi-backend.html#enable-multiple-storage-back-ends

    Partial-Bug: #1665272
    Change-Id: I22c3e74b0874c051bee89e4609088facf95b4664