[nova] spec for feature liasion needed

Hi，nova core team: In Ussuri we add the feature liaison to lead the feature to do [1], now there are some specs needed find a feature liaison, as follows: 1. https://review.opendev.org/#/c/580336/ Support re-configure deleted_on_termination in server 2. https://review.opendev.org/#/c/663563/ Add flavor group 3. https://review.opendev.org/#/c/682302/ Allow specify user to reset password 4. https://review.opendev.org/#/c/691651/ Support fuzzy querying instance by tag [1] http://specs.openstack.org/openstack/nova-specs/readme.html#feature-liaison-... Thanks. Brin Zhang