Move to Ansible 3.4.0 (#7672)

* Ansible: move to Ansible 3.4.0 which uses ansible-base 2.10.10

* Docs: add a note about ansible upgrade post 2.9.x

* CI: ensure ansible is removed before ansible 3.x is installed to avoid pip failures

* Ansible: use newer ansible-lint

* Fix ansible-lint 5.0.11 found issues

* syntax issues
* risky-file-permissions
* var-naming
* role-name
* molecule tests

* Mitogen: use 0.3.0rc1 which adds support for ansible 2.10+

* Pin ansible-base to 2.10.11 to get package fix on RHEL8

roles/kubernetes/node/tasks/kubelet.yml

@@ -18,6 +18,7 @@
     src: "kubelet.env.{{ kubeletConfig_api_version }}.j2"
     dest: "{{ kube_config_dir }}/kubelet.env"
     backup: yes
+    mode: 0640
   notify: Node | restart kubelet
   tags:
     - kubelet
@@ -27,6 +28,7 @@
   template:
     src: "kubelet-config.{{ kubeletConfig_api_version }}.yaml.j2"
     dest: "{{ kube_config_dir }}/kubelet-config.yaml"
+    mode: 0640
   notify: Kubelet | restart kubelet
   tags:
     - kubelet
@@ -37,6 +39,7 @@
     src: "kubelet.service.j2"
     dest: "/etc/systemd/system/kubelet.service"
     backup: "yes"
+    mode: 0644
   notify: Node | restart kubelet
   tags:
     - kubelet