code: @Override
      public ListGroupsForUserResult listGroupsForUser(ListGroupsForUserRequest request) {
          request = beforeClientExecution(request);
          return executeListGroupsForUser(request);
      }
docs: <p>
  Lists the IAM groups that the specified IAM user belongs to.
  </p>
  <p>
  You can paginate the results using the <code>MaxItems</code> and <code>Marker</code> parameters.
  </p>
  
  @param listGroupsForUserRequest
  @return Result of the ListGroupsForUser operation returned by the service.
  @throws NoSuchEntityException
  The request was rejected because it referenced a resource entity that does not exist. The error message
  describes the resource.
  @throws ServiceFailureException
  The request processing has failed because of an unknown error, exception or failure.
  @sample AmazonIdentityManagement.ListGroupsForUser
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/iam-2010-05-08/ListGroupsForUser" target="_top">AWS API
  Documentation</a>