protected Properties getDistributedSystemProperties() {
    return getDistributedSystemProperties(null);
  }
Creates a Properties object with configuration settings that the launcher has that should take
precedence over anything the user has defined in their gemfire properties file.

@return a Properties object with GemFire properties that the launcher has defined.
@see #getDistributedSystemProperties(java.util.Properties)
@see java.util.Properties
geode-core/src/main/java/org/apache/geode/distributed/AbstractLauncher.java