Fix CREATE TABLE ... LIKE ... INCLUDING INDEXES to not cause unwanted

 Fix CREATE TABLE ... LIKE ... INCLUDING INDEXES to not cause unwanted
 tablespace permissions failures when copying an index that is in the
 database's default tablespace.  A side-effect of the change is that explicitly
 specifying the default tablespace no longer triggers a permissions check;
 this is not how it was done in pre-8.3 releases but is argued to be more
 consistent.  Per bug #3921 from Andrew Gilligan.  (Note: I argued in the
 subsequent discussion that maybe LIKE shouldn't copy index tablespaces
 at all, but since no one indicated agreement with that idea, I've refrained
 from doing it.)