List<BlueprintServiceConfigElement> getConfigElements() {
      return configElements;
    }
Internal class meant to represent the collection of configuration
items and configuration attributes that are associated with a given service.

This class is used to support proper configuration versioning when
Ambari Blueprints is used to deploy a cluster.
ambari-server/src/main/java/org/apache/ambari/server/topology/ClusterConfigurationRequest.java