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

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 982b82d6b1fd007b9357ce198d13a55544888534
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2013-11-14T15:35:15Z
Releases: 9.4.0
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.

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