jaxb2-plugins/validation: no more reflection to solve chicken-and-egg  problem

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
jaxb2-plugins/validator: tests

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
jaxb2-plugins: tests simplification

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
jaxb2-plugins/metadata: todo note

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>