containerd support (#4664)

* Add limited containerd support

Containerd support for Ubuntu + Calico

* Added CRI-O support for ubuntu

* containerd support.

* Reset  containerd support.

* fix lint.

* implemented feedback

* Change task name cri xx instead of cri-o in reset task and timeout condition.

* set crictl to fixed version

* Use docker-ce's container.io package for containerd.

* Add check containerd is installable or not.

* Avoid stop docker when use containerd and optimize retry for reset.

* Add config.toml.

* Fixed containerd for kubelet.env.

* Merge PR #4629

* Remove unused ubuntu variable for containerd

* Polish code for containerd and cri-o

* Refactoring cri socket configuration.

* Configurable conmon.

* Remove unused crictl/runc download

* Now crictl and runc is downloaded by common crictl.yml.

* fixed yamllint error

* Fixed brokenfiles by conflict.

* Remove commented line in config.toml

* Remove readded v1.12.x version

* Fixed broken set_docker_image_facts

* Fix yamllint errors.

* Remove unused apt source

* Fix crictl could not be installed

* Add containerd config from skolekonov's PR #4601

roles/download/tasks/main.yml

@@ -7,6 +7,25 @@
     - download
     - upload
 
+- name: Use cri-o for cri connection
+  set_fact:
+    cri_socket: /var/run/crio/crio.sock
+  when: container_manager == 'crio'
+
+- name: Use containerd for cri connetion
+  set_fact:
+    cri_socket: /var/run/containerd/containerd.sock
+  when: container_manager == 'containerd'
+
+- name: Use docker for cri connetion
+  set_fact:
+    cri_socket: /var/run/dockershim.sock
+  when: container_manager == 'docker'
+
+- include_tasks: ../../container-engine/containerd/tasks/crictl.yml
+  when:
+    - container_manager in ['containerd', 'crio']
+
 - name: download | Get kubeadm binary and list of required images
   import_tasks: prep_kubeadm_images.yml
   when: