unnecessary contextual/non-contextual distinction in OpenWebBeansEJBIntercpetor

The separation between contextual and non-contextual is wrong/harmful and unnecessary.

• We should be managing a CreationalContext for the lifetime of the interceptor instance and using that for dependent instanes
• We should not rely on the thread-locals beyond @PostConstruct
• Method invocations on non-contextual EJB's must be decoratable