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

tests/cloud_playbooks/upload-logs-gcs.yml

@@ -33,11 +33,13 @@
       template:
         src: gcs_life.json.j2
         dest: "{{ dir }}/gcs_life.json"
+        mode: 0644
 
     - name: Create a boto config to access GCS
       template:
         src: boto.j2
         dest: "{{ dir }}/.boto"
+        mode: 0640
       no_log: True
 
     - name: Download gsutil cp installer
@@ -74,5 +76,5 @@
       failed_when: false
       no_log: True
 
-    - debug:
+    - debug:  # noqa unnamed-task
         msg: "A public url https://storage.googleapis.com/{{ test_name }}/{{ file_name }}"