@ModuleOption("an initial delay when using a fixed delay trigger, expressed in TimeUnits (seconds by default)")
	public void setInitialDelay(int initialDelay) {
		this.initialDelay = initialDelay;
	}
Mixin for options that include a periodic fixed-delay trigger.
fixedDelay remains in annotated classes to avoid breaking changes
due to differing defaults.

@author Gary Russell
spring-xd-module-spi/src/main/java/org/springframework/xd/module/options/mixins/PeriodicTriggerMixin.java