
When pre-built images are used, they can be quite large (CoreOS is more than 700 MiB, the same probably applies to other live ISOs). When deploying many nodes at the same time, the disk usage may become really large. This change uses the same ImageCache as for instance images for ISO images as well. Story: #2008909 Task: #42497 Change-Id: I891fd484f98042039895d82046199e8b29975100