Remove --kube-root deprecated kind argument

The --kube-root flag has been deprecated in kind for some time and will
be removed. The current equivalent functionality is to pass the path to
the kubernetes source as the first non-flag argument to "build
node-image".

This updates the prow script to use the newer preferred method in
preparation for kind dropping the flag.

Signed-off-by: Sean McGinnis <[email protected]>

Author: stmcginnis

prow.sh

@@ -624,7 +624,7 @@ start_cluster () {
             go_version="$(go_version_for_kubernetes "${CSI_PROW_WORK}/src/kubernetes" "$version")" || die "cannot proceed without knowing Go version for Kubernetes"
             # Changing into the Kubernetes source code directory is a workaround for https://github.com/kubernetes-sigs/kind/issues/1910
             # shellcheck disable=SC2046
-            (cd "${CSI_PROW_WORK}/src/kubernetes" && run_with_go "$go_version" kind build node-image --image csiprow/node:latest --kube-root "${CSI_PROW_WORK}/src/kubernetes") || die "'kind build node-image' failed"
+            (cd "${CSI_PROW_WORK}/src/kubernetes" && run_with_go "$go_version" kind build node-image "${CSI_PROW_WORK}/src/kubernetes" --image csiprow/node:latest) || die "'kind build node-image' failed"
             csi_prow_kind_have_kubernetes=true
         fi
         image="csiprow/node:latest"