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

Noah Misch <noah@leadboat.com>

Commit: 3f920e876bdc045959ebb82e44245cb839da0df4
Author: Noah Misch <noah@leadboat.com>
Date: 2020-12-25T19:03:05Z
Releases: 9.6.21
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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