code: @Override
      public ListSecurityConfigurationsResult listSecurityConfigurations(ListSecurityConfigurationsRequest request) {
          request = beforeClientExecution(request);
          return executeListSecurityConfigurations(request);
      }
docs: <p>
  Lists all the security configurations visible to this account, providing their creation dates and times, and
  their names. This call returns a maximum of 50 clusters per call, but returns a marker to track the paging of the
  cluster list across multiple ListSecurityConfigurations calls.
  </p>
  
  @param listSecurityConfigurationsRequest
  @return Result of the ListSecurityConfigurations operation returned by the service.
  @throws InternalServerException
  This exception occurs when there is an internal failure in the EMR service.
  @throws InvalidRequestException
  This exception occurs when there is something wrong with user input.
  @sample AmazonElasticMapReduce.ListSecurityConfigurations
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticmapreduce-2009-03-31/ListSecurityConfigurations"
  target="_top">AWS API Documentation</a>