Revert "In the pg_upgrade test suite, don't write to src/test/regress."

Noah Misch <noah@leadboat.com>

Commit: 2604751c73e59a1dd148361345b643676c9e4110
Author: Noah Misch <noah@leadboat.com>
Date: 2019-05-19T22:24:46Z
Releases: 9.5.18
Revert "In the pg_upgrade test suite, don't write to src/test/regress."

This reverts commit bd1592e8570282b1650af6b8eede0016496daecd.  It had
multiple defects.

Discussion: https://postgr.es/m/12717.1558304356@sss.pgh.pa.us

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