Always test for cinder v2 API

See https://github.com/crowbar/barclamp-cinder/pull/220
Merge pull request #118 from vuntz/cinder-v2-always

Always test for cinder v2 API
Put spaces around = in tempest.conf
Reorder options & update comments in tempest.conf
Add/remove the trivial new/old options in tempest.conf
Add new object-storage-feature-enabled options
Add remaining new options from current tempest