6ec75970b3
Currently nodepool is defaulting to the qcow2 if no format was given in the diskimage config. However nodepool also can auto-detect the image format based on clouds.yaml. This is not taken into account leading to qcow2 added when using raw-only clouds and auto-detection. This can be fixed by delaying the fallback to the point where we actually do the build. Change-Id: Ic1d9b5abd837a3225cc13da30a80ebf1dda61b64