Follow the rule that regression-test-created roles are named "regress_xxx".

Tom Lane <tgl@sss.pgh.pa.us>

Commit: bf270892f1be2713d47d7a9c452b5ea17d39af8e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-06-26T03:16:35Z
Releases: 11.5
Follow the rule that regression-test-created roles are named "regress_xxx".

contrib/amcheck didn't get the memo either.

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