Add script for generating binary hashes (#5470)

Change-Id: I4498d1c0585ee98c23856208d660caadf67cab34

scripts/download_hash.sh

+#!/bin/sh
+set -eo pipefail
+
+VERSIONS="$@"
+ARCHITECTURES="arm arm64 amd64"
+DOWNLOADS="kubelet kubectl kubeadm"
+DOWNLOAD_DIR="tmp/kubeadm_hasher"
+
+if [ -z "$VERSIONS" ]; then
+  echo "USAGE: $0 <versions>"
+  exit 1
+fi
+
+mkdir -p ${DOWNLOAD_DIR}
+for download in ${DOWNLOADS}; do
+  echo -e "\n\n${download}_checksums:"
+  for arch in ${ARCHITECTURES}; do
+    echo -e "  ${arch}:"
+    for version in ${VERSIONS}; do
+      TARGET="${DOWNLOAD_DIR}/${download}-$version-$arch"
+      if [ ! -f ${TARGET} ]; then
+        curl -s -o ${TARGET} "https://storage.googleapis.com/kubernetes-release/release/${version}/bin/linux/${arch}/${download}"
+      fi
+      echo -e "    ${version}: $(sha256sum ${TARGET} | awk '{print $1}')"
+    done
+  done
+done
+echo -e "\n\nAdd these values to roles/download/defaults/main.yml"