FIX: Unneded (extra) cycles in some tasks (#1393)

roles/kubernetes/master/tasks/post-upgrade.yml

@@ -6,6 +6,7 @@
   delegate_to: "{{item}}"
   with_items: "{{groups['kube-master']}}"
   when: needs_etcd_migration|bool
+  run_once: true
 
 - name: "Post-upgrade | Pause for kubelet stop"
   pause:
@@ -19,6 +20,7 @@
   delegate_to: "{{item}}"
   with_items: "{{groups['kube-master']}}"
   when: needs_etcd_migration|bool
+  run_once: true
 
 - name: "Post-upgrade | etcd3 upgrade | purge etcd2 k8s data"
   command: "{{ bin_dir }}/etcdctl --endpoints={{ etcd_access_addresses }} rm -r /registry"

roles/kubernetes/master/tasks/pre-upgrade.yml

@@ -79,6 +79,7 @@
     - ["kube-apiserver", "kube-controller-manager", "kube-scheduler"]
   register: kube_apiserver_manifest_replaced
   when: (secret_changed|default(false) or etcd_secret_changed|default(false) or needs_etcd_migration|bool) and kube_apiserver_manifest.stat.exists
+  run_once: true
 
 - name: "Pre-upgrade | etcd3 upgrade | stop etcd"
   service:
@@ -87,6 +88,7 @@
   delegate_to: "{{item}}"
   with_items: "{{groups['etcd']}}"
   when: needs_etcd_migration|bool
+  run_once: true
 
 - name: "Pre-upgrade | etcd3 upgrade | migrate data"
   command: "{{ bin_dir }}/etcdctl migrate --data-dir=\"{{ etcd_data_dir }}\" --wal-dir=\"{{ etcd_data_dir }}/member/wal\""
@@ -96,6 +98,7 @@
   with_items: "{{groups['etcd']}}"
   register: etcd_migrated
   when: needs_etcd_migration|bool
+  run_once: true
 
 - name: "Pre-upgrade | etcd3 upgrade | start etcd"
   service:
@@ -104,3 +107,4 @@
   delegate_to: "{{item}}"
   with_items: "{{groups['etcd']}}"
   when: needs_etcd_migration|bool
+  run_once: true