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/control-plane/tasks/kubeadm-backup.yml

@@ -12,7 +12,7 @@
     - apiserver-kubelet-client.key
     - front-proxy-client.crt
     - front-proxy-client.key
-  ignore_errors: yes
+  ignore_errors: true  # noqa ignore-errors
 
 - name: Backup old confs
   copy:
@@ -25,4 +25,4 @@
     - controller-manager.conf
     - kubelet.conf
     - scheduler.conf
-  ignore_errors: yes
+  ignore_errors: true  # noqa ignore-errors