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/templates/kubeadm-images.yaml.j2

@@ -6,11 +6,7 @@ apiVersion: kubeadm.k8s.io/v1beta1
 {% endif %}
 kind: InitConfiguration
 nodeRegistration:
-{% if container_manager == 'crio' %}
-  criSocket: /var/run/crio/crio.sock
-{% else %}
-  criSocket: /var/run/dockershim.sock
-{% endif %}
+  criSocket: {{ cri_socket }}
 ---
 {% endif %}
 {% if kube_version is version('v1.11.0', '<') %}
@@ -37,9 +33,5 @@ etcd:
 {% endfor %}
 {% if kube_version is version('v1.12.0', '<') %}
 nodeRegistration:
-{% if container_manager == 'crio' %}
-  criSocket: /var/run/crio/crio.sock
-{% else %}
-  criSocket: /var/run/dockershim.sock
-{% endif %}
+  criSocket: {{ cri_socket }}
 {% endif %}