pgsql: pg_upgrade: assume user is install user

pg_upgrade: assume user is install user

The user specified to the upgrade was effectively the install user, but
that was not clearly stated in the comments, documentation, or error
messages.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/ee646df59ae76d14f76e6fd305c1f9f2eeafd682

Modified Files
--------------
contrib/pg_upgrade/check.c | 51 ++++++++++++++++++---------------------
contrib/pg_upgrade/pg_upgrade.h | 2 --
doc/src/sgml/pgupgrade.sgml | 2 +-
3 files changed, 25 insertions(+), 30 deletions(-)

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