Commented out https://github.com/kubernetes/kubernetes/blob/master/test/images/image-util.sh#L91
spiffxp@spiffxp-macbookpro:images (test-images/centralize-image-to-agnhost-part-3 %)$ make all-push WHAT=agnhost
./image-util.sh build agnhost
Building image for agnhost ARCH: amd64...
../image-util.sh bin agnhost
~/w/kubernetes/kubernetes/_tmp/test-images-build.bybb9W ~/w/kubernetes/kubernetes/test/images
Sending build context to Docker daemon 33.84MB
Step 1/10 : FROM alpine:3.6