Message Title

Log staments added. All of them are debug (just to be able to track the flow through the decision point), except for the "no longer ignore explicit DiscriminatorColumn" case, which logs a WARN:

10:30:44,200  WARN AnnotationBinder:910 - HHH000457: Joined inheritance hierarchy [org.hibernate.test.joinedsubclass.JoinedSubclassWithExplicitDiscriminatorTest$Animal] defined explicit @DiscriminatorColumn.  Legacy Hibernate behavior was to ignore the @DiscriminatorColumn.  However, as part of issue HHH-6911 we now apply the explicit @DiscriminatorColumn.  If you would prefer the legacy behavior, enable the `hibernate.discriminator.ignore_explicit_for_joined` setting (hibernate.discriminator.ignore_explicit_for_joined=true)