Add containerd_extra_args

[azuwis]

What type of PR is this?
/kind feature

What this PR does / why we need it:
This is useful for custom containerd config, e.g. auth

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[azuwis]

I signed it

[oomichi]

/cc @oomichi

[oomichi]

container_config is deprecated as

kubespray/roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

Lines 311 to 317 in bef1e62

	- name: Stop if using deprecated containerd_config variable
	assert:
	that: containerd_config is not defined
	msg: "Variable containerd_config is now deprecated. See https://github.com/kubernetes-sigs/kubespray/blob/master/inventory/sample/group_vars/all/containerd.yml for details."
	when:
	- containerd_config is defined
	- not ignore_assert_errors

It is necessary to add containerd_extra_args or something instead.

[azuwis]

Renamed to containerd_extra_config

[oomichi]

Renamed to containerd_extra_config

There are weave_extra_args, kube_router_extra_args, ingress_nginx_extra_args.
so containerd_extra_args seems better for consistency in Kubespray.

[oomichi]

One more thing: Please add the default value into roles/container-engine/containerd/defaults/main.yml

[azuwis]

Renamed to containerd_extra_args and added default value.

[oomichi]

Thanks for updating.

/ok-to-test
/lgtm

[oomichi]

/retitle Add containerd_extra_args

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: azuwis, floryut

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