public AdminAttributes setPort(Integer port) {
		this.put(PORT_KEY, String.valueOf(port));
		return this;
	}
Constructor to be called when the attributes are already known. If an id is not present in the map, one will be
generated.

@param attributes the admin server's attributes
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/cluster/AdminAttributes.java