Add support for Kata Containers (#6256)

* 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

roles/container-engine/kata-containers/tasks/main.yml

@@ -0,0 +1,29 @@
+---
+
+- name: Download artifacts
+  unarchive:
+    src: "{{ kata_containers_release_url }}"
+    dest: /
+    remote_src: true
+
+- name: Create config directory
+  file:
+    path: "{{ kata_containers_config_dir }}"
+    state: directory
+
+- name: Set configuration
+  template:
+    src: "{{ item }}.j2"
+    dest: "{{ kata_containers_config_dir }}/{{ item }}"
+  with_items:
+    - configuration-qemu.toml
+
+- name: Set containerd bin
+  vars:
+    shim: "{{ item }}"
+  template:
+    dest: "{{ kata_containers_containerd_bin_dir }}/containerd-shim-kata-{{ item }}-v2"
+    src: containerd-shim-kata-v2.j2
+    mode: 0755
+  with_items:
+    - qemu