Containerd: make molecule testing more relevant

* replace ubuntu18 with ubuntu20
* add centos8 and debian11 to molecule tests
* run kubernetes/preinstall role to ensure relevancy
  of test including dependency packages

roles/container-engine/containerd/molecule/default/molecule.yml

@@ -7,12 +7,30 @@ lint: |
   set -e
   yamllint -c ../../../.yamllint .
 platforms:
-  - name: ubuntu18
-    box: generic/ubuntu1804
-    cpus: 2
+  - name: ubuntu20
+    box: generic/ubuntu2004
+    cpus: 1
     memory: 1024
     groups:
       - kube_control_plane
+      - kube_node
+      - k8s_cluster
+  - name: debian11
+    box: generic/debian11
+    cpus: 1
+    memory: 1024
+    groups:
+      - kube_control_plane
+      - kube_node
+      - k8s_cluster
+  - name: centos8
+    box: generic/centos8
+    cpus: 1
+    memory: 1024
+    groups:
+      - kube_control_plane
+      - kube_node
+      - k8s_cluster
 provisioner:
   name: ansible
   env:

roles/container-engine/containerd/molecule/default/prepare.yml

@@ -2,5 +2,10 @@
 - name: Prepare
   hosts: all
   gather_facts: False
+  become: true
+  vars:
+    ignore_assert_errors: true
   roles:
+    - role: kubespray-defaults
     - role: bootstrap-os
+    - { role: kubernetes/preinstall, tags: ["bootstrap-os"] }