pgsql: pg_upgrade: change -u to -U, for consistency

pg_upgrade: change -u to -U, for consistency
Change -u (user) option to -U, for consistency with other tools like
pg_dump and psql. Also expand --user to --username, again for
consistency.
BACKWARD INCOMPATIBILITY

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/457d6cf049c57cabe9b46ea13f26138040a214ec

Modified Files
--------------
contrib/pg_upgrade/option.c | 8 ++++----
doc/src/sgml/pgupgrade.sgml | 4 ++--
2 files changed, 6 insertions(+), 6 deletions(-)

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