docs: def execute(self):
          """
          Execute the actions necessary to perform a `molecule login` and
          returns None.
  
          :return: None
          """
          c = self._config
          if ((not c.state.created) and c.driver.managed):
              msg = 'Instances not created.  Please create instances first.'
              util.sysexit_with_message(msg)
  
          hosts = [d['name'] for d in self._config.platforms.instances]
          hostname = self._get_hostname(hosts)
          self._get_login(hostname)