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/download/tasks/download_file.yml

@@ -48,6 +48,7 @@
     - not download_localhost
 
   # This must always be called, to check if the checksum matches. On no-match the file is re-downloaded.
+  # This task will avoid logging it's parameters to not leak environment passwords in the log
   - name: download_file | Download item
     get_url:
       url: "{{ download.url }}"
@@ -67,6 +68,7 @@
     retries: 4
     delay: "{{ retry_stagger | default(5) }}"
     environment: "{{ proxy_env }}"
+    no_log: true
 
   - name: download_file | Copy file back to ansible host file cache
     synchronize: