Re: Added schema level support for publication.

FYI - I found a small problem with one of the new PublicationObjSpec
parser error messages that was introduced by the recent schema
publication commit [1].

The error message text is assuming that the error originates from
CREATE PUBLICATION, but actually that same error can also come from
ALTER PUBLICATION.

For example,

e.g.1) Here the error came from CREATE PUBLICATION, so the message
text looks OK.

test_pub=# CREATE PUBLICATION p1 FOR t1;
2021-11-04 10:50:17.208 AEDT [738] ERROR:  FOR TABLE/FOR ALL TABLES IN
SCHEMA should be specified before the table/schema name(s) at
character 27
2021-11-04 10:50:17.208 AEDT [738] STATEMENT:  CREATE PUBLICATION p1 FOR t1;
ERROR:  FOR TABLE/FOR ALL TABLES IN SCHEMA should be specified before
the table/schema name(s)
LINE 1: CREATE PUBLICATION p1 FOR t1;
                                  ^
~~

e.g.2) Here the error came from ALTER PUBLICATION, so the message text
is not OK because the ALTER syntax [2] does not even have a FOR
keyword.

test_pub=# ALTER PUBLICATION p1 SET t1;
2021-11-04 10:51:53.912 AEDT [738] ERROR:  FOR TABLE/FOR ALL TABLES IN
SCHEMA should be specified before the table/schema name(s) at
character 26
2021-11-04 10:51:53.912 AEDT [738] STATEMENT:  ALTER PUBLICATION p1 SET t1;
ERROR:  FOR TABLE/FOR ALL TABLES IN SCHEMA should be specified before
the table/schema name(s)
LINE 1: ALTER PUBLICATION p1 SET t1;
                                 ^
------
[1] https://github.com/postgres/postgres/commit/5a2832465fd8984d089e8c44c094e6900d987fcd
[2] https://www.postgresql.org/docs/devel/sql-alterpublication.html

Kind Regards,
Peter Smith.
Fujitsu Australia