Synchronize error messages.

Robert Haas <rhaas@postgresql.org>

Commit: ad4a7ed0996ee044ee7291559deddf9842d8bbf7
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-10-12T19:14:22Z
Releases: 11.0
Synchronize error messages.

Commits 6476b26115f3ef25a9cd87880e0ac5ec5f7a05f6
and 14f67a8ee282ebc0de78e773fbd597f460ab4a54 didn't use quite the
same error message for what is basically the same situation.

Amit Langote, pared back a bit by me.

Discussion: http://postgr.es/m/54dc76d0-3b5b-ba5a-27dc-fb31a3975b61@lab.ntt.co.jp

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