vagrant: 'kubeadm init --skip-preflight-checks' is deprecated

New versions of kubeadm do not have --skip-preflight-checks anymore. It
seems to have been replaced by --ignore-preflight-errors=all.

Before running 'kubeadm init', check if the help text lists the
--skip-preflight-checks option. If it does, then it needs to be used,
otherwise use --ignore-preflight-errors=all by default.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

Author: nixpanic

vagrant/roles/master/tasks/main.yml

@@ -30,8 +30,17 @@
   register: kubelet
 
 - block:
+  - name: get parameters of kubeadm init
+    command: kubeadm init --help
+    register: kubeadm_init_help
+
+  - name: kubeadm needs deprecated --skip-preflight-checks
+    set_fact:
+      kubeadm_preflight: '--skip-preflight-checks'
+    when: kubeadm_init_help.stdout.find('--skip-preflight-checks') != -1
+
   - name: kubeadm init
-    command: kubeadm init --skip-preflight-checks --token={{ kubernetes_token }} --kubernetes-version=v{{ kube_ver.stdout }}  --apiserver-advertise-address={{ ansible_eth1.ipv4.address }}
+    command: kubeadm init {{ kubeadm_preflight | default('--ignore-preflight-errors=all') }} --token={{ kubernetes_token }} --kubernetes-version=v{{ kube_ver.stdout }}  --apiserver-advertise-address={{ ansible_eth1.ipv4.address }}
 
   - name: create root kube dir
     file: