There was one incorrect version number, and it seems easier to edit a
conf.d file than one large one... Finally, be explicit about which
cluster we start in the end.

This reverts commit bafa25ee.

See team#40909 tpo/community/hackweek#26

the file is obsolete and not supported anymore, since version 12 the
related directives must go into postgresql.conf directly

That doesn't change anything from non-SSD wipes and just takes more
time for no reason.

See team#41364

Stumbled upon this while trying to figure out whether I need staging
for spec.tpo and how I would go around doing it (team#41348).