* containerd: add hashes for 1.5.8 and 1.4.12 and make 1.5.8 the new default

* containerd: make nerdctl mandatory for container_manager = containerd

* nerdctl: bump to version 0.14.0

* containerd: use nerdctl for image manipulation

* OpenSuSE: install basic nerdctl dependencies

* Calico: Bump 3.20.x to 3.20.3

* Calico: Bump 3.18.x to 3.18.6

* Calico: add calico 3.21.1 hashes

* Add Fedora 35 image, support and CI

* Cleanup tests and allow_failure for vagrant

* nginx-ingress: bump to 1.0.4

* Disable builtin ssl_session_cache solving the problem with OpenSSL consuming memory.
* Print warning only instead of error if no IngressClass permission is available.

* nginx-ingress: bump to 1.0.4 in the README

* Add Rocky as a known OS

* Make sure Rocky includes bootstrap-centos.yml

* Update docs with Rocky Linux

* Rocky Linux wireguard and EPEL

* Rocky Linux in the list of supported distributions

* cert-manager: update to 1.5.4

* cert-manager: remove outdated guidelines on creating an initial ClusterIssuer

* make Calico 3.20.1 the default version
* drop Calico 3.17.x support

Now that 1.10 is out this is to make 1.9.9 the default. I am running
this version successfully.

* set selinux type t_etc if selinux state is enforcing

* workaround with update repo is no longer needed
remove comments about failing playbook

* grubby is not available in distros using ostree

* remove docker support because removed in fcos
update install script example with live rootfs

* do not call grubby on ostree based distro

* update docs enabling containerd on fedora coreos