requires ddt >= 0.7.0

[James Page]

The unpack decorator was introduced in ddt 0.7.0:

https://github.com/txels/ddt/commit/c55bbf5d67aba973f846004ea7b6e2a99330ce73

however this project only expresses a requirement for >= 0.4.0

[Valeriy Ponomaryov (vponomaryov)]

Thanks James for point this out.

Manila, as all other OpenStack projects, has requirements defined from dedicated project:

https://github.com/openstack/requirements/blob/master/global-requirements.txt

So, we need update this first, then manila.

[Valeriy Ponomaryov (vponomaryov)]

Added related change to requirements project - https://review.openstack.org/#/c/166162/

[Valeriy Ponomaryov (vponomaryov)]

Fixed by gerrit bot update: https://review.openstack.org/#/c/186945/

Closing.