Fix yet another bug in ON CONFLICT rule deparsing.

Andres Freund <andres@anarazel.de>

Commit: 284bef297733e553c73f1c858e0ce1532f754d18
Author: Andres Freund <andres@anarazel.de>
Date: 2015-05-23T00:16:24Z
Releases: 9.5.0
Fix yet another bug in ON CONFLICT rule deparsing.

Expand testing of rule deparsing a good bit, it's evidently needed.

Author: Peter Geoghegan, Andres Freund
Discussion: CAM3SWZQmXxZhQC32QVEOTYfNXJBJ_Q2SDENL7BV14Cq-zL0FLg@mail.gmail.com

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