pgsql: Add a regression test case for \d on an index.

Add a regression test case for \d on an index.

Previous commit shows the need for this. The coverage isn't really
thorough, but it's better than nothing.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/982b82d6b1fd007b9357ce198d13a55544888534

Modified Files
--------------
src/test/regress/expected/create_index.out | 16 ++++++++++++++++
src/test/regress/sql/create_index.sql | 2 ++
2 files changed, 18 insertions(+)

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