Merge pull request #42748 from dcbw/cfssl-localup

Automatic merge from submit-queue (batch tested with PRs 43866, 42748)

hack/cluster: download cfssl if not present

hack/local-up-cluster.sh uses cfssl to generate certificates and
will exit it cfssl is not already installed.  But other cluster-up
mechanisms (GCE) that generate certs just download cfssl if not
present.  Make local-up-cluster.sh do that too so users don't have
to bother installing it from somewhere.

cluster/vagrant/util.sh

@@ -106,7 +106,7 @@ function verify-prereqs {
 
 # Create a set of provision scripts for the master and each of the nodes
 function create-provision-scripts {
-  ensure-temp-dir
+  kube::util::ensure-temp-dir
 
   (
     echo "#! /bin/bash"