[Bug 1665272] Fix merged to charm-cinder (master)

[OpenStack Infra]

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 <liam.young at canonical.com>
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

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https://bugs.launchpad.net/bugs/1665272

Title:
  cinder-volume fails to start in Ocata when no backend is connected

Status in cinder package in Juju Charms Collection:
  In Progress

Bug description:
  When deploying the cinder charm using Ocata and no backend charm
  connected, the cinder-volume service fails to start. Error from
  cinder-volume.log:

  Configuration for cinder-volume does not specify "enabled_backends". Using DEFAULT section to configure drivers is not supported since Ocata.
  No volume service(s) started successfully, terminating.

  The charm eventually reports the dead services via juju status:

  Services not running that should be: cinder-volume

  The easiest way to see this is to run the amulet test tests/gate-
  basic-xenial-ocata. It fails with

  2017-02-16 09:17:07,356 create_cinder_volume DEBUG: Creating cinder volume...
  2017-02-16 09:17:14,114 resource_reaches_status DEBUG: Volume status wait status check: 0 [creating:available] 0974c72f-e88d-40c2-a00a-effa49abee9f
  2017-02-16 09:17:18,304 resource_reaches_status DEBUG: Volume status wait status check: 1 [error:available] 0974c72f-e88d-40c2-a00a-effa49abee9f
  ....
  2017-02-16 09:19:19,590 resource_reaches_status DEBUG: Volume status wait:  expected, actual status = error, available
  2017-02-16 09:19:19,590 resource_reaches_status DEBUG: 0974c72f-e88d-40c2-a00a-effa49abee9f never reached expected status: available

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