[nova][sfe] Nova part of Image Encryption

Hi, we would like to have a spec freeze exception for the spec for the Nova Part of Image Encryption [1] as this is part of a cross-project contribution with specs also in cinder (already merged) and glance. We will attend the next meeting on August 1st. Greetings Josephine (Luzi) [1] https://review.opendev.org/#/c/608696