public Builder set(final String propertyName, final String propertyValue) {
      distributedSystemProperties.setProperty(propertyName, propertyValue);
      return this;
    }
Sets a Geode Distributed System Property.

@param propertyName a String indicating the name of the Geode Distributed System property
       as described in {@link ConfigurationProperties}
@param propertyValue a String value for the Geode Distributed System property.
@return this Builder instance.
geode-core/src/main/java/org/apache/geode/distributed/ServerLauncher.java