private static void appendLogFileProperty(final Properties props) {
    if (!(props.containsKey(DistributedSystemConfig.LOG_FILE_NAME)
        || props.containsKey(SYSTEM_PROPERTY_PREFIX + DistributedSystemConfig.LOG_FILE_NAME))) {
      props.put(DistributedSystemConfig.LOG_FILE_NAME, DEFAULT_LOG_FILE);
    }
  }
Appends the log-file property to the Properties object if set of properties does not already
define the log-file property or the gemfire.agent.log-file property.
<p>

@param props the <code>Properties</code> to append the log-file property to if the property
       does not exist.
geode-core/src/main/java/org/apache/geode/admin/jmx/internal/AgentConfigImpl.java