Revert "Use K8s 1.14 and add kubeadm experimental control plane mode (#4317)" (#4510)

This reverts commit 316508626d.

roles/kubernetes/kubeadm/tasks/main.yml

@@ -26,12 +26,6 @@
   run_once: true
   register: temp_token
   delegate_to: "{{ groups['kube-master'][0] }}"
-  when: kubeadm_token is not defined
-
-- name: Set kubeadm_token to generated token
-  set_fact:
-    kubeadm_token: "{{ temp_token.stdout }}"
-  when: kubeadm_token is not defined
 
 - name: gets the kubeadm version
   command: "{{ bin_dir }}/kubeadm version -o short"
@@ -67,6 +61,8 @@
     dest: "{{ kube_config_dir }}/kubeadm-client.conf"
     backup: yes
   when: not is_kube_master
+  vars:
+    kubeadm_token: "{{ temp_token.stdout }}"
 
 - name: Join to cluster if needed
   environment:
@@ -126,10 +122,11 @@
     {{ bin_dir }}/kubectl --kubeconfig {{ kube_config_dir }}/admin.conf get configmap kube-proxy -n kube-system -o yaml
     | sed 's#server:.*#server:\ {{ kube_apiserver_endpoint }}#g'
     | {{ bin_dir }}/kubectl --kubeconfig {{ kube_config_dir }}/admin.conf replace -f -
+  delegate_to: "{{groups['kube-master']|first}}"
   run_once: true
   when:
-    - inventory_hostname == groups['kube-master']|first
     - kubeadm_config_api_fqdn is not defined
+    - is_kube_master
     - kubeadm_discovery_address != kube_apiserver_endpoint
     - not kube_proxy_remove
   tags:
@@ -137,10 +134,11 @@
 
 - name: Restart all kube-proxy pods to ensure that they load the new configmap
   shell: "{{ bin_dir }}/kubectl --kubeconfig {{ kube_config_dir }}/admin.conf delete pod -n kube-system -l k8s-app=kube-proxy --force --grace-period=0"
+  delegate_to: "{{groups['kube-master']|first}}"
   run_once: true
   when:
-    - inventory_hostname == groups['kube-master']|first
     - kubeadm_config_api_fqdn is not defined
+    - is_kube_master
     - kubeadm_discovery_address != kube_apiserver_endpoint
     - not kube_proxy_remove
   tags:
@@ -161,10 +159,11 @@
 # is fixed
 - name: Delete kube-proxy daemonset if kube_proxy_remove set, e.g. kube_network_plugin providing proxy services
   shell: "{{ bin_dir }}/kubectl --kubeconfig /etc/kubernetes/admin.conf delete daemonset -n kube-system kube-proxy"
+  delegate_to: "{{groups['kube-master']|first}}"
   run_once: true
   when:
-    - inventory_hostname == groups['kube-master']|first
     - kube_proxy_remove
+    - is_kube_master
     - kubeadm_discovery_address != kube_apiserver_endpoint
   tags:
     - kube-proxy