no_proxy is a pain to get right, and having proxy variables present causes issues
(k8s components get proxy configuration after upgrade, see #7100)

It's better to only configure what require proxy:
- the runtime (containerd/docker/crio)
- the package manager + apt_key
- the download tasks

Tested with the following clusters
- 4 CentOS 8 nodes
- 1 Ubuntu 20.04 node

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

tags are not inherited for include_role therefore the change
from include to import

Co-authored-by: Hans Feldt <hafe@users.noreply.github.com>

* assembly fallback_ips and no_proxy var only one time on localhost and populate result on all hosts

* add tag always, fix ansible lint errors

* workaround to mitogen issue dw/mitogen#663

* do not gather fact before install python on coreos like distros

* try to pass docker molecule test

* Adding yaml linter to ci check

* Minor linting fixes from yamllint

* Changing CI to install python pkgs from requirements.txt

- adding in a secondary requirements.txt for tests
- moving yamllint to tests requirements