Remove unnecessary outer join in PG domains reflection query

[Former user]

The query for PostgreSQL domains (issued on each table reflection) left-outer-joins to pg_catalog.pg_constraint but does not reference any column from that table.

Attached patch against tip removes the join.

[Former user]

Patch against tip to remove the unnecessary join

[Former user]

Same patch against tip of rel_0_7 branch

[Mike Bayer]

thanks ! wonder why that's there.

[Mike Bayer]

thanks !

74b2fb5daccff12d45615769be801bb32cbdac33 a860d12a710e97b03f162336840a8b23a8aaf330

[Mike Bayer]

Removing milestone: 0.7.7 (automated comment)