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/meta/main.yml

@@ -1,5 +1,12 @@
 ---
 dependencies:
+  - role: container-engine/kata-containers
+    when:
+      - kata_containers_enabled
+    tags:
+      - container-engine
+      - kata-containers
+
   - role: container-engine/cri-o
     when:
       - container_manager == 'crio'