* Remove DruidProcessingModule, QueryableModule and QueryRunnerFactoryModule from DI for coordinator, overlord, middle-manager. Add RouterDruidProcessing not to allocate processing resources on router
* Fix examples
* Fixes
* Revert Peon configs and add comments
* Remove qualifier
ITUnionQueryTest runs 4 realtime tasks and runs a unionQuery over them,
the worker is not able to run all the tasks concurrently on machines
with less cpu cores as it picks default worker capacity.
Explicitly specify worker capacity to avoid this.