Add a regression test case for plpython function returning setof RECORD.

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

Commit: 6bff0e7d92133d50c064d9f652f538891873aa32
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2013-12-11T22:22:55Z
Releases: 9.4.0
Add a regression test case for plpython function returning setof RECORD.

We had coverage for functions returning setof a named composite type,
but not for anonymous records, which is a somewhat different code path.
In view of recent crash report from Sergey Konoplev, this seems worth
testing, though I doubt there's any deterministic bug here today.

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