Reduce lock level for ALTER TABLE ... ADD CHECK .. NOT VALID

[Simon Riggs]

897795240cfaaed724af2f53ed2c50c9862f951f forgot to reduce the lock
level for CHECK constraints when allowing them to be NOT VALID.

This is simple and safe, since check constraints are not used in
planning until validated.

-- 
Simon Riggs                http://www.EnterpriseDB.com/

alter_table_add_check_constraint_reduce_lock_level.v1.patch
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