Automatically use previous targets for rebuild in build_image
Automatically use previous targets for rebuild in build_image

If an target list is supplied to build_image, we should attempt to
build the image using the targets the image was previously built for.

henrysher/imagefactory,jmcabandara/imagefactory,redhat-imaging/imagefactory,henrysher/imagefactory,redhat-imaging/imagefactory,jmcabandara/imagefactory,LalatenduMohanty/imagefactory,LalatenduMohanty/imagefactory