pg_upgrade: Remove converter plugin facility.

Robert Haas <rhaas@postgresql.org>

Commit: 6f56b41ac0cd7092b91834da02e70514d28b8edb
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-03-08T13:13:02Z
Releases: 9.6.0
pg_upgrade: Remove converter plugin facility.

We've not found a use for this so far, and the current need, which
is to convert the visibility map to a new format, does not suit the
existing design anyway.  So just rip it out.

Author: Masahiko Sawada, slightly revised by me.
Discussion: 20160215211313.GB31273@momjian.us

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