Don't use tempest special_fields

This has been removed, which now causes these
tests to fail.

Tempest change: https://review.openstack.org/#/c/448869/

Change-Id: I31310dc9b3834e0bf16618db3e473f17eab2b610
2 files changed
tree: 248fe8d9cf9f9c1eeab3c548ef796981c87025b3
  1. cinder/