pgsql: pg_upgrade: compare control version, not catalog version

pg_upgrade: compare control version, not catalog version

Also modify test for the possibility the large object value might not
exist in the old cluster.

Fix for commit e1598a15f4fb0f076a6034d3d3debb9776aff07a

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/acc8e41681b4c07c60b2663e2e94bbff338189be

Modified Files
--------------
contrib/pg_upgrade/controldata.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

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