psql: Tab completion updates

Add/complete support for:

- ALTER DOMAIN / VALIDATE CONSTRAINT
- ALTER DOMAIN / RENAME
- ALTER DOMAIN / RENAME CONSTRAINT
- ALTER TABLE / RENAME CONSTRAINT

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/cc71ceab57d763f8f443346badd8e826b3b09e6e

Modified Files
--------------
src/bin/psql/tab-complete.c |   38 +++++++++++++++++++++++++++++++-------
1 files changed, 31 insertions(+), 7 deletions(-)

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