Merge pull request #9616 from jeffbean/kube_addons

kube_addons - Adding variable with default for kubectl bin.

cluster/saltbase/salt/kube-addons/kube-addons.sh

@@ -17,7 +17,7 @@
 # The business logic for whether a given object should be created
 # was already enforced by salt, and /etc/kubernetes/addons is the
 # managed result is of that. Start everything below that directory.
-KUBECTL=/usr/local/bin/kubectl
+KUBECTL=${KUBECTL_BIN:-/usr/local/bin/kubectl}
 
 function create-kubeconfig-secret() {
   local -r token=$1