We are beginning the process of removing these images from OpenDev.
Later changes will need to clean up our grafyaml configs and nodepool
configs, but this allows us to remove jobs from zuul and once those are
all gone we can remove the nodes from nodepool then remove the grafyaml
configs.
Change-Id: I6c2bc2fc4314e8eb205766f22738135551191452
14dad80b2a