code: def get_matching_service_template_file(service_name, template_files):
      
      # If this is a subservice, use the parent service's template
      service_name = service_name.split('.')[0]
      if service_name in template_files:
          return template_files[service_name]
      return None
docs: Return the template file that goes with the given service name, or return
      None if there's no match.  Subservices return the parent service's file.