code: @Override
      public ListTaskDefinitionFamiliesResult listTaskDefinitionFamilies(ListTaskDefinitionFamiliesRequest request) {
          request = beforeClientExecution(request);
          return executeListTaskDefinitionFamilies(request);
      }
docs: <p>
  Returns a list of task definition families that are registered to your account (which may include task definition
  families that no longer have any <code>ACTIVE</code> task definition revisions).
  </p>
  <p>
  You can filter out task definition families that do not contain any <code>ACTIVE</code> task definition revisions
  by setting the <code>status</code> parameter to <code>ACTIVE</code>. You can also filter the results with the
  <code>familyPrefix</code> parameter.
  </p>
  
  @param listTaskDefinitionFamiliesRequest
  @return Result of the ListTaskDefinitionFamilies operation returned by the service.
  @throws ServerException
  These errors are usually caused by a server issue.
  @throws ClientException
  These errors are usually caused by a client action, such as using an action or resource on behalf of a
  user that doesn't have permissions to use the action or resource, or specifying an identifier that is not
  valid.
  @throws InvalidParameterException
  The specified parameter is invalid. Review the available parameters for the API request.
  @sample AmazonECS.ListTaskDefinitionFamilies
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ecs-2014-11-13/ListTaskDefinitionFamilies" target="_top">AWS
  API Documentation</a>