tests: split kubectl download task into multiple with retries (kubernetes#3059)

Author: kayrus

tests/playbooks/roles/install-k3s/tasks/main.yaml

@@ -154,16 +154,39 @@
   retries: 100
   delay: 5
 
-- name: Prepare kubectl and kubeconfig file
+- name: Prepare kubeconfig file
   shell:
     executable: /bin/bash
     cmd: |
       set -ex
 
       mkdir -p {{ ansible_user_dir }}/.kube
       scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i {{ ansible_user_dir }}/.ssh/id_rsa ubuntu@{{ k3s_fip }}:/etc/rancher/k3s/k3s.yaml {{ ansible_user_dir }}/.kube/config
-      curl -sLO# https://dl.k8s.io/release/$(curl -Ls https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl
-      chmod +x ./kubectl; sudo mv ./kubectl /usr/local/bin/kubectl
+
+- name: Get latest kubectl version
+  uri:
+    url: https://dl.k8s.io/release/stable.txt
+    return_content: yes
+  register: kubectl_version
+  retries: 5
+  delay: 10
+  until: kubectl_version.status == 200
+
+- name: Download kubectl binary
+  get_url:
+    url: "https://dl.k8s.io/release/{{ kubectl_version.content | trim }}/bin/linux/amd64/kubectl"
+    dest: /usr/local/bin/kubectl
+    mode: '0755'
+  become: true
+  retries: 5
+  delay: 10
+
+- name: Set kubectl cluster config
+  shell:
+    executable: /bin/bash
+    cmd: |
+      set -ex
+
       kubectl config set-cluster default --server=https://{{ k3s_fip }}:6443 --kubeconfig {{ ansible_user_dir }}/.kube/config
 
 - name: Wait for k8s node ready