pg_upgrade: remove support for 8.3 old clusters

Bruce Momjian <bruce@momjian.us>

Commit: 2209b3923a7afe0b6033ecfea972219df252ca8e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-08-26T00:05:07Z
Releases: 9.5.0
pg_upgrade:  remove support for 8.3 old clusters

This trims down the code, and is in preparation for hardening pg_upgrade
against auto-oid assignment.

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