@Override
  public KeyManagementService<SecretKeySpec> getKeyManagementService() throws GeneralSecurityException {
    return new SingleKeyManagementService(kmsConfig, kmsDefaultContainerKey);
  }
Instantiates {@link SingleKeyManagementServiceFactory}
@param verifiableProperties {@link VerifiableProperties} to load configs from
@param clusterName Cluster name for which {@link KeyManagementService} is requested for
@param registry {@link MetricRegistry} to use
ambry-router/src/main/java/com/github/ambry/router/SingleKeyManagementServiceFactory.java