pgsql: Add more subscription DDL tests

Add more subscription DDL tests

Add more tests for various variants of subscription DDL commands, based
on code coverage report. Fix a small bug discovered by that.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e3920ac823353f200cfecde74076d3d40f79e2b1

Modified Files
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src/backend/commands/subscriptioncmds.c | 2 +-
src/test/regress/expected/subscription.out | 29 +++++++++++++++++++++++++++++
src/test/regress/sql/subscription.sql | 27 +++++++++++++++++++++++++++
3 files changed, 57 insertions(+), 1 deletion(-)

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