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/preinstall/tasks/0062-networkmanager-unmanaged-devices.yml

@@ -19,6 +19,7 @@
       [keyfile]
       unmanaged-devices+=interface-name:cali*;interface-name:tunl*;interface-name:vxlan.calico
     dest: /etc/NetworkManager/conf.d/calico.conf
+    mode: 0644
   when:
     - nm_check.rc == 0
     - kube_network_plugin == "calico"
@@ -32,5 +33,6 @@
       [keyfile]
       unmanaged-devices+=interface-name:kube-ipvs0;interface-name:nodelocaldns
     dest: /etc/NetworkManager/conf.d/k8s.conf
+    mode: 0644
   when: nm_check.rc == 0
   notify: Preinstall | reload NetworkManager