Add molecule test for bootstrap-os (#5845)

roles/bootstrap-os/molecule/default/molecule.yml

@@ -0,0 +1,44 @@
+---
+scenario:
+  name: default
+  test_sequence:
+    - lint
+    - destroy
+    - dependency
+    - syntax
+    - create
+    - prepare
+    - converge
+    # - idempotence # skip
+    - side_effect
+    - verify
+    - destroy
+dependency:
+  name: galaxy
+lint:
+  name: yamllint
+  options:
+    config-file: ../../.yamllint
+driver:
+  name: vagrant
+  provider:
+    name: libvirt
+platforms:
+  - name: ubuntu18
+    box: generic/ubuntu1804
+    cpus: 2
+    memory: 2048
+provisioner:
+  name: ansible
+  lint:
+    name: ansible-lint
+  inventory:
+    group_vars:
+      all:
+        user:
+          name: foo
+          comment: My test comment
+verifier:
+  name: testinfra
+  lint:
+    name: flake8