Use kubeadm_feature_gates instead of kube_feature_gates to leverage kubeadm feature gates and not to interfere with k8s components feature gates (#7447)

* Add documentation for audit webhook variables

* Enclose the value of  audit_webhook_server_url in a codeblock

* Add default value for audit_webhook_batch_max_wait

* Set containerd version to 1.4.3

* Set containerd version to 1.4.4

Co-authored-by: Barry Melbourne <9964974+bmelbourne@users.noreply.github.com>

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

This is a small step to replace "master" with "control-plane" in
Kubespray project.

* Fix etcd download dest

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

* Only support Helm v3, cleanup install

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

No longer used/supported

If no_proxy_exclude_workers is true, workers will be excluded from the no_proxy variable.  This prevents docker engine restarting when scaling workers. (#6520)

Signed-off-by: holmesb <5072156+holmesb@users.noreply.github.com>

* Rotate kubelet server certificate.

* CI test kubelet server cert rotation

* Approve kubelet serving certificates in tests.

Signed-off-by: Wang Zhen <lazybetrayer@gmail.com>

Add the `container_manager` variable as a Cluster Variable in the global Docs

* Fix incorrect assertion comparison for kube_network_node_prefix

* Ignore assertion comparison for kube_network_node_prefix when using calico

* Adding more var docs description for kube_network_node_prefix

* Fixing trailing whitespaces

* Ability to define plugins.cri.containerd params

* addition of containerd field commented as an example

* documentation of containerd_config

* Introduce kubelet_config_extra_args and kubelet_node_config_extra_args to pass params to kubelet via YAML config

* kubelet_config_extra_args is not the alternative

Fix http link to https link for security

Signed-off-by: Nguyen Hai Truong <truongnh@vn.fujitsu.com>

* set helm 3.0 as default

* remove trainling space in vars.yml

* switched to helm 3.0.3

* improve documentation about user acct and connecting to API

* fix lint

* Add Helm 3.x support

* tiller enabled when helm < 3.0.0

Signed-off-by: Guangming Wang <guangming.wang@daocloud.io>

* Add support for Docker plugins

* support multiple Docker plugins using looped include

* fix yamllint error

* enable kubelet client certificate rotation

* change to variable kubelet_rotate_certificates

Both kubedns and dnsmasq modes are long not maintained.
We should run dns_late steps at the end because sshd
makes DNS lookups during Ansible run and has 2s timeouts
for each failed lookup trying to connect to coredns before
it is ready.

Added a line documenting where to find acceptable values for the
`docker_version` setting. If you use a value that is not used as
a key value by `docker_versioned_pkg` the container-engine/docker
playbook will throw a "Unexpected templating type error". (e.g.
If you use '18.06.1' or '18.06.1-ce', neither of which is used
as a key value of `docker_versioned_pkg`, rather than '18.06',
you'll get an error when installing on Ubuntu 18.04.)

* 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

Introduced variable node_taints which can be set in inventory for
specific hosts or in group_vars, which generates --register-with-taints
command line argument for kubelet.