Removed @Resource annotations on several components

The annotation caused issues when an application has more than one
event bus. Even when a specific event bus was configured, Spring
would still try to autowire one (especially when using java config).

This may cause exceptions for applications relying on the autowiring.
 These exceptions will occur on startup and are easy to fix. Simply
 explicitly configure a property for the event bus on these components.

Issue #AXON-274 Fixed