pgsql: Fix CREATE TABLE ...

Log Message:
-----------
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.)

Modified Files:
--------------
pgsql/src/backend/commands:
indexcmds.c (r1.170 -> r1.171)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/indexcmds.c?r1=1.170&r2=1.171)
tablecmds.c (r1.241 -> r1.242)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c?r1=1.241&r2=1.242)
pgsql/src/backend/executor:
execMain.c (r1.302 -> r1.303)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execMain.c?r1=1.302&r2=1.303)
pgsql/src/backend/parser:
parse_utilcmd.c (r2.8 -> r2.9)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_utilcmd.c?r1=2.8&r2=2.9)
pgsql/src/include/nodes:
parsenodes.h (r1.358 -> r1.359)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h?r1=1.358&r2=1.359)