Upgrade Scality driver to match minimum features

The Scality driver needs an upgrade to match minimum features:
- Havana: Clone Volume
- Icehouse: Extend Volume

Also, some features (Copy Image to Volume, Copy Volume to Image) already work but need automated tests.

Change-Id: Iac5ac2c58fd5ce62823f829a0a014decb4ad4958
Fixes: bug 1210240
Merge "Upgrade Scality driver to match minimum features"