code: @Override
      public ListNamespacesResult listNamespaces(ListNamespacesRequest request) {
          request = beforeClientExecution(request);
          return executeListNamespaces(request);
      }
docs: <p>
  Lists summary information about the namespaces that were created by the current AWS account.
  </p>
  
  @param listNamespacesRequest
  @return Result of the ListNamespaces operation returned by the service.
  @throws InvalidInputException
  One or more specified values aren't valid. For example, a required value might be missing, a numeric
  value might be outside the allowed range, or a string value might exceed length constraints.
  @sample AWSServiceDiscovery.ListNamespaces
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/servicediscovery-2017-03-14/ListNamespaces"
  target="_top">AWS API Documentation</a>