Add support for renaming domain constraints

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/38b9693fd9847f4dcf6ff2fc469a7f2aac6385d9

Modified Files
--------------
doc/src/sgml/ref/alter_domain.sgml   |   29 +++++++++++++++-
src/backend/catalog/objectaddress.c  |    2 +-
src/backend/catalog/pg_constraint.c  |   62 ++++++++++++++++++++++++++++++++-
src/backend/commands/tablecmds.c     |   61 ++++++++++++++++++++++++---------
src/backend/commands/typecmds.c      |    3 +-
src/backend/parser/gram.y            |   10 +++++
src/backend/parser/parse_utilcmd.c   |    2 +-
src/include/catalog/pg_constraint.h  |    3 +-
src/include/commands/typecmds.h      |    3 ++
src/test/regress/expected/domain.out |    7 ++++
src/test/regress/sql/domain.sql      |   10 +++++
11 files changed, 168 insertions(+), 24 deletions(-)

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