Added molecule tests for 'test' role

.gitlab-ci.yml

roles/test/README.md

roles/test/defaults/main.yml

roles/test/molecule/default/converge.yml

...le/default/inventory/group_vars/example_servers_group.yml

...t/molecule/default/inventory/host_vars/example_server.yml

roles/test/molecule/default/molecule.yml

roles/test/molecule/default/tests/test_default.yml

roles/test/tasks/main.yml

roles/test/vars/main.yml