ab4b015cea
When we build the image we need a base image to be defined. For CentOS it's done automatically in client, but if we need to build something else we need to download it and define it explicitly. base_image_url - URL of base image base_image_path - path to save it on host Change-Id: I10bd9868fcfd3a4d5992fc7d7b6200e908e75e25