* add strategy mitogen_linear when installed mitogen

* add small docs

Rename playbook file

The raw action executes as a regular Mitogen connection, which requires Python on the target, so add strategy: linear to bootstrap-os role playbook.

* add mitogen to  CI test
fix typo

* enable mitogen test on deploy-part1 tests
change version from master to release
download tar.gz archive

* run all CI tests with mitogen

* disable mitogen with upgrade CI tests

* enable mitogen on CI tests via env vars

* disable mitogen on CI test by default, enable on some different OS

* disable mitogen CI test on centos8
(get error  /usr/bin/python: No such file or directory)

* replace removed repo with kubic repository for centos 7

* add crio configuration for centos8

* add crio configurations for debian

* use correct crio version for fedora

* simplify calulation of required crio version
- gives possibility to overwrite

* change default path for runc

* change default for seccomp path

* change default for conmon

* bump minimal ansible version to 2.8.0

* check ansible version in separate playbook

* declare kubic repo for ubuntu

* do not install crictl twice

* move fedora repo modular tasks to crio_repo file

* move centos repo tasks to crio_repo

* declare crio version matrix for ubuntu

* update documentation crio support for ubuntu

Downgrade coredns to 1.6.5 due to upgrade errors while migrating coredns configmap (Corefile) (#5960)

cloud_provider option exists in ./inventory/sample/group_vars/all/all.yml
In addition, the quick start shows to create configuration by copying
./inventory/sample. So this updates path of all.yml for fitting the above.

* Add proxy support to CRI-O service

The crio.service requires proxy environment variables when it's
deployed behind a corporated network. This change creates a systemd
configuration file when the proxy variables are defined.

* Remove unnecesary crio's tasks

* Fix kube-proxy ds nodeselector for older versions

* Fix for ansible-lint

* Gather just the necessary facts

* Move fact gathering to separate playbook.

The playbook that bootstrap openSUSE servers assumes that the
/etc/sysconfig/proxy file exists but the execution fails when
these file is not present. This change guarantees its existence.

https://github.com/colemickens/azure-kubernetes-status is deprecated
and will be removed soon as the README.
So this updates the link to the repository for a new one.

The Terraform installation part states that is for CentOS 7, but the echo command refers to OS X binary. Updated the echo command to use the Linux version.

* Terraform/OpenStack: Allow free form worker node definition

* fixup! Terraform/OpenStack: Allow free form worker node definition

* 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

* Generate unique username per cluster

* rename admin kubeconfig shell output to raw_admin_kubeconfig

* Make the linter happy

* Fix lint errors

* Cleaning up tasks