pgsql: pg_upgrade: remove --single-transaction usage

pg_upgrade: remove --single-transaction usage

With AtEOXact applied, --single-transaction makes pg_restore slower, and
has the potential to require lock table configuration, so remove the
argument.

Per suggestion from Tom.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/861ad67bd9546a8328ea31d0141406db16f4c57c

Modified Files
--------------
contrib/pg_upgrade/pg_upgrade.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)

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