code: public DomainCommandBuilder setMasterPortHint(final String port) {
          if (port != null) {
              setMasterPortHint(Integer.parseInt(port));
          }
          return this;
      }
docs: Sets the system property {@code jboss.domain.master.port}. In a default slave host configuration this is used
  to configure the port of the master host controller. Ignores {@code null} values or values less than 0.
  <p/>
  <b>Note:</b> This option only works if the standard system property has not been removed from the remote host.
  If the system property was removed the port provided has no effect.
  
  @param port the port
  
  @return the builder
  
  @throws java.lang.NumberFormatException if the port is not a valid integer