* Add fallback to node drain using --disable-eviction flag

Signed-off-by: Utku Ozdemir <uoz@protonmail.com>

* Move drain fallback tasks to separate file

Signed-off-by: Utku Ozdemir <uoz@protonmail.com>

* Add delegate_facts to fix the drain fallback

Signed-off-by: Utku Ozdemir <uoz@protonmail.com>

* Fix ansible-lint error

Signed-off-by: Utku Ozdemir <uoz@protonmail.com>

* Move drain fallback into block

Signed-off-by: Utku Ozdemir <uoz@protonmail.com>

* After upgrade, allow cilium to be back before uncordoning

* add eol

* use kube_config_dir variable
resolves https://github.com/kubernetes-sigs/kubespray/pull/7978#discussion_r721685549

The path of kubeconfig should be configurable, and its default value
is /etc/kubernetes/admin.conf. Most paths of the file are configurable
but some were not. This make those configurable.

* During pre-upgrade add a flag to always cordon

* empty

* empty

* empty

* Better default val

This replaces kube-master with kube_control_plane because of [1]:

  The Kubernetes project is moving away from wording that is
  considered offensive. A new working group WG Naming was created
  to track this work, and the word "master" was declared as offensive.
  A proposal was formalized for replacing the word "master" with
  "control plane". This means it should be removed from source code,
  documentation, and user-facing configuration from Kubernetes and
  its sub-projects.

NOTE: The reason why this changes it to kube_control_plane not
      kube-control-plane is for valid group names on ansible.

[1]: https://github.com/kubernetes/enhancements/blob/master/keps/sig-cluster-lifecycle/kubeadm/2067-rename-master-label-taint/README.md#motivation

Add retries to drain during upgrade. Allow leaving nodes cordoned after drain failure. Allow continuing upgrade if drain fails. (#7206)

* Add prompt to upgrade node or delay before upgrade

* add docs

* respect kube_override_hostname during removal/upgrade

* Use hostvars in loop

* Remove non-kubeadm deployment

* More cleanup

* More cleanup

* More cleanup

* More cleanup

* Fix gitlab

* Try stop gce first before absent to make the delete process work

* More cleanup

* Fix bug with checking if kubeadm has already run

* Fix bug with checking if kubeadm has already run

* More fixes

* Fix test

* fix

* Fix gitlab checkout untill kubespray 2.8 is on quay

* Fixed

* Add upgrade path from non-kubeadm to kubeadm. Revert ssl path

* Readd secret checking

* Do gitlab checks from v2.7.0 test upgrade path to 2.8.0

* fix typo

* Fix CI jobs to kubeadm again. Fix broken hyperkube path

* Fix gitlab

* Fix rotate tokens

* More fixes

* More fixes

* Fix tokens

* failed

* version_compare

* succeeded

* skipped

* success

* version_compare becomes version since ansible 2.5

* ansible minimal version updated in doc and spec

* last version_compare

Uses correct flag for draining with a pod selector
Verifies minimum kubectl version for compatibility

Optionally do not drain nodes by setting drain_nodes to false
Optionally set a labelselector to target which pods should be drained.

Raise drain timeout to 5m

* 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

Graceful upgrades require 3 nodes
Drain now has a command timeout of 40s

Based on #718 introduced by rsmitty.

Includes all roles and all options to support deployment of
new hosts in case they were added to inventory.

Main difference here is that master role is evaluated first
so that master components get upgraded first.

Fixes #694