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

recover-control-plane.yml

@@ -12,13 +12,13 @@
     - { role: kubespray-defaults}
     - { role: bastion-ssh-config, tags: ["localhost", "bastion"]}
 
-- hosts: "{{ groups['etcd'] | first }}"
+- hosts: etcd[0]
   environment: "{{ proxy_disable_env }}"
   roles:
     - { role: kubespray-defaults}
     - { role: recover_control_plane/etcd }
 
-- hosts: "{{ groups['kube_control_plane'] | first }}"
+- hosts: kube_control_plane[0]
   environment: "{{ proxy_disable_env }}"
   roles:
     - { role: kubespray-defaults}
@@ -26,7 +26,7 @@
 
 - include: cluster.yml
 
-- hosts: "{{ groups['kube_control_plane'] }}"
+- hosts: kube_control_plane
   environment: "{{ proxy_disable_env }}"
   roles:
     - { role: kubespray-defaults}