Cinder v2 API is deprecated since pike release. Along with the removal
of cinder v2 API support in cinderclient (change I335db5c1799e drops
v2 support), this commit drops cinder v2 support in horizon.
The next release of python-cinderclient drops v2 support,
so horizon needs to use v3 classes.
Includes a workaround in unit tests for two cinderclient.v3 classes
that are missing in the cinderclient releases prior to 8.0.0. The
workaround can be removed once cinderclient change I335db5c1799edb2
is merged and released.
Co-Authored-By: Akihiro Motoki <amotoki@gmail.com>
Change-Id: Iab0f097fab6696462572dc6ea53767c91e5411b1
b58ac2894b