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

Noah Misch <noah@leadboat.com>

Commit: 9518978e223b758f0efbc28422c5bf164d521f28
Author: Noah Misch <noah@leadboat.com>
Date: 2019-05-19T22:24:46Z
Releases: 11.4
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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Cited messages not in the archive: 12717.1558304356@sss.pgh.pa.us