docs: public static InetAddress getInetAddress ( Properties props, String key, InetAddress def ) {
          String addr = props.getProperty(key);
          if ( addr != null ) {
              try {
                  def = InetAddress.getByName(addr);
              }
              catch ( UnknownHostException uhe ) {
                  log.error("Unknown host " + addr, uhe);
              }
          }
          return def;
      }