Improve INSERT .. ON CONFLICT error message.

Robert Haas <rhaas@postgresql.org>

Commit: b8dd19af50950d4933da7ad60f93388e9d0eb851
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-10-13T19:33:07Z
Releases: 9.6.0
Improve INSERT .. ON CONFLICT error message.

Peter Geoghegan, reviewed by me.

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