Fix back-patch of "Invalidate acl.c caches when pg_authid changes."

Noah Misch <noah@leadboat.com>

Commit: d176b9d5e187fc0317f04847fab0d284d467edb8
Author: Noah Misch <noah@leadboat.com>
Date: 2020-12-25T19:02:56Z
Releases: 10.16
Fix back-patch of "Invalidate acl.c caches when pg_authid changes."

Test script role names and error messages differed in v10, 9.6 and 9.5.

Discussion: https://postgr.es/m/20201221095028.GB3777719@rfd.leadboat.com

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