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/node/tasks/main.yml

@@ -57,6 +57,7 @@
   file:
     path: /etc/modules-load.d
     state: directory
+    mode: 0755
 
 - name: Enable br_netfilter module
   modprobe:
@@ -68,6 +69,7 @@
   copy:
     dest: /etc/modules-load.d/kubespray-br_netfilter.conf
     content: br_netfilter
+    mode: 0644
   when: modinfo_br_netfilter.rc == 0
 
 # kube-proxy needs net.bridge.bridge-nf-call-iptables enabled when found if br_netfilter is not a module
@@ -108,7 +110,7 @@
     name: nf_conntrack_ipv4
     state: present
   register: modprobe_nf_conntrack_ipv4
-  ignore_errors: yes
+  ignore_errors: true  # noqa ignore-errors
   when:
     - kube_proxy_mode == 'ipvs'
   tags:
@@ -117,6 +119,7 @@
 - name: Persist ip_vs modules
   copy:
     dest: /etc/modules-load.d/kube_proxy-ipvs.conf
+    mode: 0644
     content: |
       ip_vs
       ip_vs_rr