public RepositoryVersion getRepositoryVersion() {
    return m_targetVersion;
  }
The target version for all services and components in the upgrade or
downgrade. If this is an upgrade, then this is the version tha all services
are moving to. If this is a downgrade, then this is the version that all
services are coming back from.

@return the target versions for all services.
ambari-server-spi/src/main/java/org/apache/ambari/spi/upgrade/UpgradeInformation.java