
the filter tries to use list_extensions API of novaclient, however it was removed in Ussuri release https://review.opendev.org/c/openstack/python-novaclient/+/686516 All the former extensions are long ago rolled into Nova "core" code, so we may take the "extension" this filter depends on as given. Change-Id: Idc03d997cfedfc2fcc967cca519997d157df115a