public void setDefaultBackOffMultiplier(double defaultBackOffMultiplier) {
		this.defaultBackOffMultiplier = defaultBackOffMultiplier;
	}
Set the default retry back off multiplier for this bus; can be overridden with consumer 'backOffMultiplier'
property.
@param defaultBackOffMultiplier
spring-xd-messagebus-spi/src/main/java/org/springframework/xd/dirt/integration/bus/MessageBusSupport.java