protected final void setProperty(@NotNull String key, String value) {
    if (!value.equals(NULL_VALUE)) {
      properties.setProperty(key, value);
    } else {
      properties.remove(key);
    }
  }
Set a property with the input key and value. If the key is existed, the value will be
overridden. If the value is an empty String, the key will be removed.

@param key the key.
@param value the value.
integration-test/src/main/java/org/apache/iotdb/it/env/cluster/config/MppBaseConfig.java