* 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

* add support for using ansible 2.10.x for deploying kubespray

* move dns-autoscaler-clusterrole{binding}.yml to files/ folder

* note that ansible 2.10 is now experimentally supported

* coredns: move files to templates like before #4341

CentOS 7 provides up to date Ansible with really old jinja version

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>

We have multiple breakage report with Ansible 2.10+ in https://github.com/kubernetes-sigs/kubespray/issues/6762


README.md already recommended 2.9+

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

* bump minimal ansible version to 2.8.0

* check ansible version in separate playbook