stable/20.02

Set default branch for git review/gerrit. Switch amulet tests to stable. Switch zaza bundles to stable charms. Switch to using stable charm-helpers branch. Change-Id: I6139ae41192f8325eebfb0e604ed21d0bb87d096
Cinder Backup to external Swift
Overview
Support for backing up volumes to external swift. Cinder-backup service configuration is propagated to the cinder charm.
In order to use it external swift URL is needed along with authentication details.
To use:
juju deploy cinder
juju deploy cinder-backup-swift-proxy
juju add-relation cinder-backup-swift-proxy cinder
Bugs
Please report bugs on Launchpad. For general questions please refer to the OpenStack Charm Guide.
Description
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