Add extra method to skip tests if they does't meet requirement in default volume type

Changed schema for volume type because of changed response schema in
upstream https://opendev.org/openstack/python-openstackclient/commit/5231ade27c8a08e3d7fd5573d4dda6fa47d0ae67

Fixes-Bug: PRODX-25580


Change-Id: I7e918d672fb19094fc03f6e107617b0fa3adceb8
2 files changed