Check that the pg_upgrade user specified is a super-user.

Also report the error message when the post-pg_ctl connection fails.

Per private bug report from EnterpriseDB.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/81301b85781245676f874ae3908015f05d3aaaa2

Modified Files
--------------
contrib/pg_upgrade/check.c  |   29 ++++++++++++++++++++++++++++-
contrib/pg_upgrade/server.c |    6 ++++--
2 files changed, 32 insertions(+), 3 deletions(-)

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Next:	From: Bruce Momjian	Date: 2011-05-07 16:17:51
	Subject: pgsql: In pg_upgrade, report non-super-user username in error message.
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