[CI] remove docker stand-alone molecule test

roles/container-engine/docker/molecule/default/converge.yml

@@ -1,7 +0,0 @@
----
-- name: Converge
-  hosts: all
-  become: true
-  roles:
-    - role: kubespray-defaults
-    - role: container-engine/docker

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

@@ -1,33 +0,0 @@
----
-driver:
-  name: vagrant
-  provider:
-    name: libvirt
-lint: |
-  set -e
-  yamllint -c ../../../.yamllint .
-platforms:
-  - name: ubuntu18
-    box: generic/ubuntu1804
-    cpus: 2
-    memory: 1024
-  - name: almalinux8
-    box: almalinux/8
-    cpus: 2
-    memory: 1024
-provisioner:
-  name: ansible
-  env:
-    ANSIBLE_ROLES_PATH: ../../../../
-  config_options:
-    defaults:
-      callbacks_enabled: profile_tasks
-      timeout: 120
-  lint:
-    name: ansible-lint
-    options:
-      c: ../../../.ansible-lint
-verifier:
-  name: testinfra
-  lint:
-    name: flake8

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

@@ -1,6 +0,0 @@
----
-- name: Prepare
-  hosts: all
-  gather_facts: False
-  roles:
-    - role: bootstrap-os

roles/container-engine/docker/molecule/default/tests/test_default.py

@@ -1,19 +0,0 @@
-import os
-
-import testinfra.utils.ansible_runner
-
-testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
-    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
-
-
-def test_docker_service(host):
-    docker = host.service("docker")
-    assert docker.is_running
-    assert docker.is_enabled
-
-
-def test_docker_run(host):
-    with host.sudo():
-        cmd = host.command("docker run quay.io/kubespray/hello-world:latest")
-    assert cmd.rc == 0
-    assert "Hello from Docker" in cmd.stdout