Provide initial guidelines for a container engine migration (docker-2-containerd), with special emphasis on the fact that the procedure is still not officially supported. (#8471)

Follow up from https://github.com/kubernetes-sigs/kubespray/issues/8431

.

Signed-off-by: Julio Morimoto <julio@morimoto.net.br>

* fixes issues in vSphere Terraform contrib. #8436

* fix formatting

* add variables to the main module and document changes

* add missing newline

* Fix terraform Warning

Version constraints inside provider configuration blocks are deprecated

Terraform 0.13 and earlier allowed provider version constraints inside the
provider configuration block, but that is now deprecated and will be removed
in a future version of Terraform. To silence this warning, move the provider
version constraint into the required_providers block.

* Fix terraform Warning: Quoted references are deprecated

* terraform: Update GCP Ubuntu to latest LTS

* Fix fedora jobs - followup

* Update OpenSUSE Leap to 15.3

* Fix cilium version in README + update minor 1.11.1

Signed-off-by: Cyril Corbon <corboncyril@gmail.com>

Signed-off-by: Cyril Corbon <corboncyril@gmail.com>

[cert-manager] Fix missing RBAC rules for ClusterRole cert-manager-cainjector kubernetes-sigs#8104. (#8444)

Co-authored-by: Emin Aktaş <eminaktas34@gmail.com>
Co-authored-by: Yasin Taha Erol <yasintahaerol@gmail.com>
Signed-off-by: necatican <necaticanyildirim@gmail.com>

Co-authored-by: Emin Aktaş <eminaktas34@gmail.com>
Co-authored-by: Yasin Taha Erol <yasintahaerol@gmail.com>

The tf-elastx_cleanup test job was failed with error message:

Port xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx cannot be deleted
directly via the port API: has device owner network:router_interface.

That means necessary to remove a subnet from the router before
deleting the port.
This adds a method to removes a subnet from the router automatically.

* Parameterized snaphot controller namespaces

* add ns yml

* add docs

* namespace

More information:

- kubernetes-sigs/kubespray#8393
- jetstack/cert-manager#4102
- jetstack/cert-manager#3717

Signed-off-by: Cyril Corbon <corboncyril@gmail.com>

Signed-off-by: Mathieu Parent <mathieu.parent@insee.fr>

Signed-off-by: Cyril Corbon <corboncyril@gmail.com>

* contrib: add cloud-init support for terraform vms

This change enables instance customization via cloud-init,
for example: additional CA certs, custom SSH access etc.

* contrib: update docs for terraform cloud-init

* contrib: disable yamllint in cloud-init

require-starting-space rule breaks cloud-init header

* contrib: documenation formatting

* yamllint: disable comments related checks

* docs: markdown formatting

This allow to workaround #8375 by using image_command_tool=crictl
when containerd_registries is used for containerd.

Also changes image_info_command_on_localhost for docker to return digests.

This fixes the following types of failures:
- empty-string-compare
- literal-compare
- risky-file-permissions
- risky-shell-pipe
- var-spacing

In addition, this changes .gitlab-ci/lint.yml to block the same issue
by using the same method at Kubespray CI.