Add -d option to vanilla images
Add -d option to vanilla images

Change-Id: I79e60b26747c62d50940b4387ad823ea6fca5220

openstack/sahara-image-elements,openstack/sahara-image-elements,bigfootproject/sahara-image-elements,crobby/sahara-image-elements,bigfootproject/sahara-image-elements,crobby/sahara-image-elements,uladz/sahara-image-elements,uladz/sahara-image-elements