Support scheduler extension of Deltaspike

Scheduler instance can be injected into a bean:

public class SchedulerController {
	@Inject Scheduler scheduler;
}

It is provided in Deltaspike by a producer method SchedulerProducer.produceScheduler(). Extension selects an implementation of scheduler to be returned by this producer. It vetoes all available implementations of scheduler to prevent them from being available for injection beside the producer bean.
So, in JBossTools, the above injection point should be resolved to SchedulerProducer.produceScheduler().