
It seems nova has changed defaults on who can create zero-sized disk instances [1] and now os_tempest jobs failed with Only volume-backed servers are allowed for flavors with zero disk. Changing the disk to 1 fixes the same. [1] https://review.openstack.org/#/c/603910/ Change-Id: Id7467d037a7b0b4cb46add587395b21f28fb9df7