void setGracefulShutdownQuietPeriodMillis(long gracefulShutdownQuietPeriodMillis) {
        this.gracefulShutdownQuietPeriodMillis = gracefulShutdownQuietPeriodMillis;
    }
Sets the {@link Port}s of the {@link Server}.
dropwizard2/src/main/java/com/linecorp/armeria/dropwizard/ArmeriaSettings.java