code: public static void addSwiftCredentials(Configuration configuration) {
      PropertyKey[] propertyNames = {PropertyKey.SWIFT_API_KEY, PropertyKey.SWIFT_TENANT_KEY,
          PropertyKey.SWIFT_USER_KEY, PropertyKey.SWIFT_AUTH_URL_KEY,
          PropertyKey.SWIFT_AUTH_METHOD_KEY, PropertyKey.SWIFT_PASSWORD_KEY,
          PropertyKey.SWIFT_SIMULATION, PropertyKey.SWIFT_REGION_KEY};
      setConfigurationFromSystemProperties(configuration, propertyNames);
    }
docs: Adds Swift keys to the given Hadoop Configuration object if the user has specified them using
  System properties, and they're not already set.
  
  This function is duplicated from {@code alluxio.underfs.hdfs.HdfsUnderFileSystemUtils}, to
  prevent the module alluxio-core-client-hdfs from depending on the module alluxio-underfs.
  
  @param configuration Hadoop configuration