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

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

Commit: 65e6d42140c8d9918638b9f73528288ab980af82
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2019-06-26T03:06:17Z
Releases: 12.0
Follow the rule that regression-test-created roles are named "regress_xxx".

contrib/amcheck didn't get the memo either.

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