public void updateEntryIdleTime(Integer timeout,
      String action, ClassName expiry) {
    entryIdleTime = ExpirationAttributesType.combine(entryIdleTime,
        ExpirationAttributesType.generate(timeout, action, expiry));
  }
update the entry idle time using timeout, action or expiry. If all three are null, there
would be no update to the existing value

@param timeout could be null
@param action could be null
@param expiry could be null
geode-core/src/main/java/org/apache/geode/cache/configuration/RegionAttributesType.java