@ApiModelProperty(name = ClusterResourceProvider.DESIRED_CONFIGS)
  public List<ConfigurationRequest> getDesiredConfig() {
    return configs;
  }
Gets any configuration-based request (if any).
@return the list of configuration requests,
or <code>null</code> if none is set.
ambari-server/src/main/java/org/apache/ambari/server/controller/ClusterRequest.java