(Based on review https://review.openstack.org/#/c/36009)
Scripts test for existence of ../share/diskimage-builder and
fall-back to ../ if not found. This allows scripts to run unmodified
from a packaged installation or a local archive/repository.
Change-Id: I0cf4c1fdb8e42ec284c56860cb15818632b93b9e
Move the ensure_nbd function call from the disk-image-create to the
disk-image-get-kernel. The image creation process does not use qemu-nbd
anymore.
Change-Id: I8ff2ad54f322a9e33d52408fa4e253a7b45900c7