def parse_clusters(config)
        OodCore::Clusters.load_file(config || '/etc/ood/config/clusters.d')
      rescue OodCore::ConfigurationNotFound
        OodCore::Clusters.new([])
      end
def parse_clusters(config)
        OodCore::Clusters.load_file(config || '/etc/ood/config/clusters.d')
      rescue OodCore::ConfigurationNotFound
        OodCore::Clusters.new([])
      end
Read in cluster config and parse it