ExtendedEntityManager should be serializable for clustering

As a quick test, I attempted to serialize an instance of EntendedEntityManager and the first casualty was a NotSerializableException on org.jboss.as.ee.beanvalidation.LazyValidatorFactory

http://pastie.org/1795594

After making the above serializable, then got:

NotSerializableException: org.hibernate.validator.engine.ValidatorFactoryImpl

Perhaps we need something like org.jboss.jca.core.bv.SerializableValidatorFactory