feat: allow extra_specs to be read by admin_or_reader

Author: rackerchris

base-helm-configs/cinder/cinder-helm-overrides.yaml

@@ -103,6 +103,8 @@ conf:
       volume_clear: zero
       volume_driver: cinder_rxt.rackspace.RXTLVM
       volume_group: cinder-volumes-1
+  policy:
+    "volume_extension:types_extra_specs:read_sensitive": "rule:xena_system_admin_or_project_reader"
   cinder:
     DEFAULT:
       allow_availability_zone_fallback: true