Become root when creating kubeadm token as part of add-nodes.yaml (#162)

Kubeadm needs access to the kubeconfig file in
/etc/kubernetes/admin.conf. This file can only be used by a user with
elevated privileges.

Signed-off-by: Alexander Brand <alexbrand09@gmail.com>

swizzle/add-nodes.yml

@@ -7,6 +7,7 @@
 
 - name: create a kubeadm token
   hosts: primary_master
+  become: yes
   tasks:
     - name: generate a kubeadm token
       command: "/usr/bin/kubeadm token create --config /etc/kubernetes/kubeadm.conf --kubeconfig /etc/kubernetes/admin.conf"