Changes due to fixed DEFAULT behaviour.

src/test/regress/GNUmakefile

src/test/regress/data/constrf.data

src/test/regress/data/constro.data

src/test/regress/expected/triggers.out

src/test/regress/input/constraints.source

src/test/regress/input/create_function_1.source

src/test/regress/output/constraints.source

src/test/regress/output/create_function_1.source

src/test/regress/sql/triggers.sql