Fix handling of auto-updatable views on inherited tables.

 Fix handling of auto-updatable views on inherited tables.
 
 An INSERT into such a view should work just like an INSERT into its base
 table, ie the insertion should go directly into that table ... not be
 duplicated into each child table, as was happening before, per bug #8275
 from Rushabh Lathia.  On the other hand, the current behavior for
 UPDATE/DELETE seems reasonable: the update/delete traverses the child
 tables, or not, depending on whether the view specifies ONLY or not.
 Add some regression tests covering this area.
 
 Dean Rasheed