hosts: Add Kubernetes machines

There is no specific playbook or role for Kubernetes.  All OS
configuration is done at install time via kickstart scripts, and
deploying Kubernetes itself is done (manually) using `kubeadm init` and
`kubeadm join`.

group_vars/k8s-controller.yml

@@ -0,0 +1 @@
+collectd_processes: '{{ collectd_processes_kubelet + collectd_processes_controller}}'

group_vars/k8s-node.yml

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+collectd_processes: '{{ collectd_processes_kubelet }}'

group_vars/kubelet.yml

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+samba_interfaces:
+- '{{ ansible_default_ipv4.interface }}'
+host_uses_firewalld: false
+collectd_processes_kubelet:
+- name: crio
+- name: kubelet
+collectd_processes_controller:
+- name: etcd
+- name: kube-apiserver
+- name: kube-controller