* Install Kata Containers as additional container runtime

* Create RuntimeClasses for Kata Containers

* Updated Vagrant to optionally run without Docker as container manager

* Updated Vagrant to optionally use Libvirt nested virtualization

* Add Kata Containers documentation

* Fix lint errors

* Add kata_containers_enabled to kubespray-defaults

* Fixed typo error

* Fixed typo error

* ADD tls cipher suites support

yaml lint

yamllint

* update test case

* update test case

We need to specify either external_openstack_tenant_name or
external_openstack_tenant_id. Those values were checked by seeing they
are defined or they have actual values separately.
However those values are always defined because of the following code
of openstack/defaults/main.yml:

external_openstack_tenant_id: "{{ lookup('env','OS_TENANT_ID')| default(lookup('env','OS_PROJECT_ID'),true) }}"
external_openstack_tenant_name: "{{ lookup('env','OS_TENANT_NAME')| default(lookup('env','OS_PROJECT_NAME'),true) }}"

So even if not specifying both values, those checks could not detect
the misconfiguration. This fixes this to detect the misconfiguration.

* MINOR: Check kernel version before enable modprobe nf_conntrack

* CLEANUP: no more need to ignore error of this task

* MINOR: Fixing yaml and ansible lint error - remove trailling-space

Co-authored-by: Hans Feldt <hafe@users.noreply.github.com>

If the special parameter "$@" is not quoted, the following command will not work:

./kubectl.sh patch storageclass my-storage-class -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

* Add oraclelinux8 and disable firewalld

Add oraclelinux8 image and disable firewalld on oraclelinux VMs

* Fix Oracle Linux repositories

As documented in: http://yum.oracle.com/getting-started.html#installing-software-from-oracle-linux-yum-server
public-yum-ol7.repo was deprecated on release 7.6. Some repos were integrated into oracle-linux-ol7.repo (i.e.: ol7_latest, ol7_addons) and other are available as packages (epel). This also adds support for oraclelinux8

* Fix to use ansible_distribution_version

Instead of ansible_distribution_major_version

* Update README.md

* bump csi containers

* bump snapshoter to 2.1.1

On OpenStack history, we used to call "tenant" for separeted namespace.
However we use "project" now instead.
Then we have replaced "tenant" with "project". Then all "TENANT" variables
also are renamed to "PROJECT".
This makes Kubespray search "PROJECT" variable also for newer OpenStack
clouds.

... to have working `hostPort` for containers.

See: https://www.kube-router.io/docs/user-guide/#hostport-support

To avoid the following error (ignored when pipefail is off)

  RUNNING HANDLER [network_plugin/calico : containerd | delete calico-node containers] *******************************************************************************
  changed: [node1] => {"attempts": 1, "changed": true, "cmd": "crictl pods --name calico-node-* -q | xargs -I% --no-run-if-empty bash -c \"crictl stopp % && crictl rmp %\"", "delta": "0:00:00.004240", "end": "2020-06-10 03:32:41.316955", "rc": 0, "start": "2020-06-10 03:32:41.312715", "stderr": "/bin/sh: crictl: command not found", "stderr_lines": ["/bin/sh: crictl: command not found"], "stdout": "", "stdout_lines": []}

with the Python ruamel.yml library

- Change True/False to true/false in a few places so file can
  be more easily round-tripped with the Python ruamel.yml library

* Manage containerd.io package with docker CRI.

* Refactor common containerd stuff to separate role

* Fix check mode and unnecessary shell.

* fix CRI-O repos for centos distributions

* fix CRI-O repos for centos distributions
- revert workarounds

* fix CRI-O repos for centos distributions
- use https for centos repos

* avoid 302 redirects for centos repos

* upgrade calico to 3.14.1

* add checksums for calico 3.14.1 and update readme

flannel, ovn and multus network plugins did not support all taint keys. This
update changes the tolerations to support them all.

According to the documentation:

```
There are two special cases: An empty key with operator Exists matches all keys,
values and effects which means this will tolerate everything. An empty effect matches
all effects with key key.
```

Usage of the empty `key` and `effect` ensures the network plugin daemonset will
be deployed on every nodes (ex: in case of custom taints, or NoExecute effect)

disable bird-check flag for probes of calico-node pods when calico_network_backend is not 'bird'. (#6217)

* Update containerd package to 1.2.13-3.2.el7

* Update Fedora containerd package versions.

* Update Redhat containerd stable and edge packages.

Modify the populate no_proxy task to use a combine rather than relying on the hash_behaviour setting to be set to merge rather than replace (#6112)

Since weave 2.5.1, `NoExecute` taint effect is no more supported,
this changes the daemonset tolerations to change this behavior.

Also remove the toleration key `CriticalAddonsOnly` not required anymore.