* 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

* Fix ansible detection for python3 and ubuntu

* Fix oracle missing centos-extras repo for containerd/docker dependencies

Clean up extra spaces, although these errors are not important, they affect the code specification.

Clean up extra spaces, although these errors are not important, they affect the code specification.

* Update vars.md to remove mention of string syntax of node_labels

Fixes https://github.com/kubernetes-sigs/kubespray/issues/6215

* Try fix makrdown linting

* Update docs/vars.md

* Update nodes.md

* fix syntax

* fix syntax - part 2

* replace master with kube_control_plane

* return etcd-master

https://github.com/kubernetes-incubator/kubespray is an old link,
this updates the link.

* replaced deprecated python package with python3 package

* removed the version due to duplication

When reset, need to clean up directory /usr/libexec.

This replaces master with "control plane" in Kubespray docs
because of [1].

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

Although these errors are not important, they affect the code specification.

* Claico Docs: clarify the algorithm to calculate calico_veth_mtu

* Update sample calico_veth_mtu

* Enable Graceful Node Shutdown for Kubernetes >= 1.21.0

* Add sample graceful shutdown parameters

* Calico: add Wireguard support

* CI: Add Calico Wireguard scenario

I recently reviewed the code, although these errors are not important, they affect the code specification.

* fix broken link in doc

* Revert "fix broken link in doc"

This reverts commit b427d1f57ff35375a97444f79eb06caf608c75d7.

* move metallb doc to right place, fixing broken link

When reset, need to clean up files kube_proxy-ipvs.conf and kubespray-br_netfilter.conf.

* terraform/openstack: Use path.root for ansible_bastion_template.txt

The path.root variable points to the root module path. Using this
instead of a relative path makes less assumptions about the current
working directory.

* terraform/openstack: Add group_vars_path variable

Previously, the group_vars path was assumed to be in CWD. The
default value for the group_vars_path variable is still relative
to CWD and thus should be backwards compatible if unset.

It's a minor change, I just corrected `–` char to `-`.

* fix group name

* fix external-openstack-cloud-config secret

* don't add ca.cert in the secret if not defined

* Clean up residual files

When reset, you need to clean up to the kerw directory.

* Update main.yml

* Docker/Containerd: move downloads urls to containerd-common

* gVisor: initial support for gVisor container runtime

$releasever can be 7Server, but there is no such CentOS path on
download.opensuse.org.

Use ansible_distribution_major_version instead of $releasever.

As [1], v2.4.0 has been released already for local_volume_provisioner.
This updates the version.

[1]: https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner/tags

We have released v2.16 of Kubespray already, so we can remove those
old groups from the test inventory as the TODO says.