pgsql: Use TSConfigRelationId in AlterTSConfiguration()

Use TSConfigRelationId in AlterTSConfiguration()

When we are altering a text search configuration, we are getting the
tuple from pg_ts_config and using its OID, so use TSConfigRelationId
when invoking any post-alter hooks and setting the object address.

Further, in the functions called from AlterTSConfiguration(), we're
saving information about the command via
EventTriggerCollectAlterTSConfig(), so we should be setting
commandCollected to true. Also add a regression test to
test_ddl_deparse for ALTER TEXT SEARCH CONFIGURATION.

Author: Artur Zakirov, a few additional comments by me
Discussion: https://www.postgresql.org/message-id/57a71eba-f2c7-e7fd-6fc0-2126ec0b39bd%40postgrespro.ru

Back-patch the fix for the InvokeObjectPostAlterHook() call to 9.3 where
it was introduced, and the fix for the ObjectAddressSet() call and
setting commandCollected to true to 9.5 where those changes to
ProcessUtilitySlow() were introduced.

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/0e3aadb682f0c76f6b21ac0058e3717eb7cc2b19

Modified Files
--------------
src/backend/commands/tsearchcmds.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)