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

This reverts commit ebe2fa6.

Author: stephenfin

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

@@ -154,39 +154,16 @@
   retries: 100
   delay: 5
 
-- name: Prepare kubeconfig file
+- name: Prepare kubectl and 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
-
-- 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
-
+      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
       kubectl config set-cluster default --server=https://{{ k3s_fip }}:6443 --kubeconfig {{ ansible_user_dir }}/.kube/config
 
 - name: Wait for k8s node ready