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

contrib/network-storage/heketi/roles/tear-down-disks/tasks/main.yml

@@ -19,7 +19,7 @@
   become: true
   shell: "pvs {{ disk_volume_device_1 }} --option vg_name | tail -n+2"
   register: "volume_groups"
-  ignore_errors: true
+  ignore_errors: true   # noqa ignore-errors
   changed_when: false
 
 - name: "Remove volume groups."  # noqa 301
@@ -35,7 +35,7 @@
     PATH: "{{ ansible_env.PATH }}:/sbin"  # Make sure we can workaround RH / CentOS conservative path management
   become: true
   command: "pvremove {{ disk_volume_device_1 }} --yes"
-  ignore_errors: true
+  ignore_errors: true   # noqa ignore-errors
 
 - name: "Remove lvm utils (RedHat)"
   become: true