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-apps/cluster_roles/tasks/oci.yml

@@ -3,6 +3,7 @@
   copy:
     src: "oci-rbac.yml"
     dest: "{{ kube_config_dir }}/oci-rbac.yml"
+    mode: 0640
   when:
   - cloud_provider is defined
   - cloud_provider == 'oci'