pgsql: Revert patch becaues of locking concerns: Allow ALTER TABLE ...

Log Message:
-----------
Revert patch becaues of locking concerns:

Allow ALTER TABLE ... ALTER CONSTRAINT ... RENAME

Joachim Wieland

Modified Files:
--------------
pgsql/doc/src/sgml:
ddl.sgml (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ddl.sgml.diff?r1=1.53&r2=1.54)
pgsql/doc/src/sgml/ref:
alter_index.sgml (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_index.sgml.diff?r1=1.7&r2=1.8)
alter_table.sgml (r1.83 -> r1.84)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_table.sgml.diff?r1=1.83&r2=1.84)
pgsql/src/backend/catalog:
pg_constraint.c (r1.29 -> r1.30)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_constraint.c.diff?r1=1.29&r2=1.30)
pg_depend.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_depend.c.diff?r1=1.18&r2=1.19)
pgsql/src/backend/commands:
alter.c (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/alter.c.diff?r1=1.16&r2=1.17)
pgsql/src/backend/parser:
gram.y (r2.528 -> r2.529)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.528&r2=2.529)
pgsql/src/backend/tcop:
utility.c (r1.251 -> r1.252)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c.diff?r1=1.251&r2=1.252)
pgsql/src/include/catalog:
dependency.h (r1.19 -> r1.20)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/dependency.h.diff?r1=1.19&r2=1.20)
pg_constraint.h (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_constraint.h.diff?r1=1.20&r2=1.21)
pgsql/src/test/regress/expected:
alter_table.out (r1.91 -> r1.92)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/alter_table.out.diff?r1=1.91&r2=1.92)
pgsql/src/test/regress/sql:
alter_table.sql (r1.53 -> r1.54)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/alter_table.sql.diff?r1=1.53&r2=1.54)