CI: convert molecule provisioning to kubevirt

Includes some change of OS version when the vagrant boxes were old ones
(Debian 10)

roles/adduser/molecule/default/molecule.yml

@@ -2,22 +2,18 @@
 role_name_check: 1
 dependency:
   name: galaxy
-driver:
-  name: vagrant
-  provider:
-    name: libvirt
 platforms:
-  - name: adduser-01
-    box: generic/ubuntu2004
-    cpus: 1
-    memory: 512
-    provider_options:
-      driver: kvm
+  - name: ubuntu20
+    cloud_image: ubuntu-2004
+    vm_cpu_cores: 1
+    vm_memory: 512
 provisioner:
   name: ansible
   config_options:
     defaults:
       callbacks_enabled: profile_tasks
       timeout: 120
+  playbooks:
+    create: ../../../../tests/cloud_playbooks/create-packet.yml
 verifier:
   name: testinfra