[Bug 1606559] Fix merged to charm-cinder (stable/16.07)

[OpenStack Infra]

Reviewed:  https://review.openstack.org/350693
Committed: https://git.openstack.org/cgit/openstack/charm-cinder/commit/?id=84881a9f483098b674e0085503ca89cf505b11a4
Submitter: Jenkins
Branch:    stable/16.07

commit 84881a9f483098b674e0085503ca89cf505b11a4
Author: Edward Hope-Morley <edward.hope-morley at canonical.com>
Date:   Tue Jul 26 14:44:49 2016 +0200

    Ensure required interfaces list is correct
    
    When a subset of cinder services is enabled, we don't expect all interfaces
    to exist and unexpected errors/warnings to be reported in workload-status.
    
    Closes-Bug: 1606559
    (cherry picked from commit 83a23cd56ac204eadaa346ca7d3132be734305d4)
    Change-Id: I9d5b6149c847c972d6fb0cfaf697d2885bbbf5c1

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https://bugs.launchpad.net/bugs/1606559

Title:
  cinder charm is not selecting required interfaces according to which
  services are enabled

Status in cinder package in Juju Charms Collection:
  Fix Released

Bug description:
  This causes problems e.g. when you only have cinder-volume enabled
  since the charm will permanently report "Missing relation: identity"
  regardless of if the keystone service is related.

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