pg_upgrade:  set vacuum_defer_cleanup_age to zero

Non-zero vacuum_defer_cleanup_age values cause pg_upgrade freezing of
the system catalogs to be incomplete, or do nothing.  This will cause
the upgrade to fail in confusing ways.

Reported-by: Laurenz Albe

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.5

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/5c1bfd627fdc0b9ab07c9ee88b4677147919bf1b

Modified Files
--------------
src/bin/pg_upgrade/server.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

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