Bean Validation - Remove distinction between property and field

Bean Validation does not do any distinction between field constraint violations and getter constraint violations.

RESTEasy introduced a distinction and is doing some reflection magic to see if a field has a getter (which is not even correct as the field could have a getter and the constraint could be on the field itself).

I don't think introducing this distinction was a good idea and it definitely is not a good idea to do reflection there. Let's get rid of it.