Move pod network to task file, after master taint

This will allow the selection of the type of pod network add-on to be
installed.  Default to flannel.

Certain pod network plugins spin up pods, requiring that the master be
able to schedule them at install time if the master is configured to
allow pods to run.

defaults/main.yml

@@ -21,6 +21,7 @@ kubernetes_allow_pods_on_master: true
 kubernetes_enable_web_ui: true
 kubernetes_web_ui_manifest_file: https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml
 
+kubernetes_pod_network_plugin: 'flannel'
 kubernetes_pod_network_cidr: '10.244.0.0/16'
 kubernetes_apiserver_advertise_address: ''
 kubernetes_version_kubeadm: 'stable-{{ kubernetes_version }}'

tasks/master-setup.yml

@@ -29,14 +29,6 @@
     dest: ~/.kube/config
     state: link
 
-- name: Configure Flannel networking.
-  command: "{{ item }}"
-  with_items:
-    - kubectl apply -f {{ kubernetes_flannel_manifest_file_rbac }}
-    - kubectl apply -f {{ kubernetes_flannel_manifest_file }}
-  register: flannel_result
-  changed_when: "'created' in flannel_result.stdout"
-
 # TODO: Check if taint exists with something like `kubectl describe nodes`
 # instead of using kubernetes_init_stat.stat.exists check.
 - name: Allow pods on master node (if configured).
@@ -45,6 +37,10 @@
     - kubernetes_allow_pods_on_master
     - not kubernetes_init_stat.stat.exists
 
+# Set up pod network.
+- include_tasks: pod-network.yml
+  when: not kubernetes_init_stat.stat.exists
+
 - name: Check if Kubernetes Dashboard UI service already exists.
   shell: kubectl get services --namespace kube-system | grep -q kubernetes-dashboard
   changed_when: false

tasks/pod-network.yml

@@ -0,0 +1,9 @@
+---
+- name: Configure Flannel networking.
+  command: "{{ item }}"
+  with_items:
+    - kubectl apply -f {{ kubernetes_flannel_manifest_file_rbac }}
+    - kubectl apply -f {{ kubernetes_flannel_manifest_file }}
+  register: flannel_result
+  when: kubernetes_pod_network_plugin == 'flannel'
+  changed_when: "'created' in flannel_result.stdout"