Better hash algorithms for k8s binaries
Better hash algorithms for k8s binaries

Let's please add sha512 as well. adding both 256 and 512 may take a lot
more time. Also checking the ASF, they are shipping sha1 and sha512, so
we are in good company.

https://dist.apache.org/repos/dist/release/ant/binaries/

Change-Id: I23977b5b71558d7b6bee51238ba5898a5a8f29f5

kubernetes/release,kubernetes/release