pgsql: pg_upgrade: shut down server after auth failure

pg_upgrade: shut down server after auth failure

Register atexit() server shutdown if pg_ctl successfully started the
server, but we can't connect to it.

Backpatch to 9.3.

Pavel Raiskup

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/ae3c8c57cbaa8d88be61dc26f7b5c138c3c98dd7

Modified Files
--------------
contrib/pg_upgrade/server.c | 34 +++++++++++++++++++++++++++++-----
1 file changed, 29 insertions(+), 5 deletions(-)

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