Enable kubeadm upgrades to any version (#1709)

roles/kubernetes/master/tasks/kubeadm-setup.yml

@@ -70,7 +70,14 @@
   notify: Master | restart kubelet
 
 - name: kubeadm | Upgrade first master
-  command: timeout -k 240s 240s {{ bin_dir }}/kubeadm upgrade apply --config={{ kube_config_dir }}/kubeadm-config.yaml {{ kube_version }} --skip-preflight-checks
+  command: >-
+    timeout -k 240s 240s
+    {{ bin_dir }}/kubeadm
+    upgrade apply -y {{ kube_version }}
+    --config={{ kube_config_dir }}/kubeadm-config.yaml
+    --skip-preflight-checks
+    --allow-experimental-upgrades
+    --allow-release-candidate-upgrades
   register: kubeadm_upgrade
   # Retry is because upload config sometimes fails
   retries: 3
@@ -124,7 +131,14 @@
   notify: Master | restart kubelet
 
 - name: kubeadm | Upgrade other masters
-  command: timeout -k 240s 240s {{ bin_dir }}/kubeadm upgrade apply --config={{ kube_config_dir }}/kubeadm-config.yaml {{ kube_version }} --skip-preflight-checks
+  command: >-
+    timeout -k 240s 240s
+    {{ bin_dir }}/kubeadm
+    upgrade apply -y {{ kube_version }}
+    --config={{ kube_config_dir }}/kubeadm-config.yaml
+    --skip-preflight-checks
+    --allow-experimental-upgrades
+    --allow-release-candidate-upgrades
   register: kubeadm_upgrade
   when: inventory_hostname != groups['kube-master']|first and (kubeadm_config.changed and admin_conf.stat.exists)
   failed_when: kubeadm_upgrade.rc != 0 and "field is immutable" not in kubeadm_upgrade.stderr