Add the `vmware/scenario/vcenter_only` alias to be able to identify the vmware test roles that can be tested with just on vcenter instance. Also, add a check to be sure we don't try to attach ESXi hosts if none has been defined.
Fixes: #63905 * Add return parameters to return after module execution https://github.com/ansible/ansible/pull/64605#discussion_r344430717 * Add moid and use_instance_uuid parameters https://github.com/ansible/ansible/pull/64605#discussion_r344431003 * Add reset playbook for test case * Delete HAS_PYVMOMI variable https://github.com/ansible/ansible/pull/64605#discussion_r344430877 * Fix because the default value of stop_action was wrong * Fix multiple sanity test error for document related * Fix remove unnecessary line break