stable/kilo cinder supports incremental backups, client does not

[Scott DAngelo]

The 'incremental' option for backup was added in Cinder kilo, and the latest python-cinderclient (1.4.0) has support for this. But the stable/kilo version of python-cinderclient does not support the 'incremental' option.
The stable/kilo client should support features in the stable/kilo Cinder service.

[Scott DAngelo (scott-dangelo)]

Merged into master with:
https://review.openstack.org/#/c/112101/
    Change-Id: Id11ecd2982ea838181b4adaa5a742fc65f864acb

[Scott DAngelo (scott-dangelo)]

Cherry-pick patch submitted:
https://review.openstack.org/#/c/231580/

[Matt Riedemann (mriedem)]

We don't backport features to stable branches. The clients only have stable branches for our gate system and so we can release patch version bug fixes, not features which would require a minor version bump according to semver.

For kilo, you should have at least cinderclient 1.1.0:

https://github.com/openstack/requirements/blob/stable/kilo/global-requirements.txt#L122

The clients are not necessarily tied to the versions in the servers though for a given release.