pgsql: pg_upgrade: preserve database and relation minmxid values

pg_upgrade: preserve database and relation minmxid values

Also set these values for pre-9.3 old clusters that don't have values to
preserve.

Analysis by Alvaro

Backpatch through 9.3

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/a61daa14d56867e90dc011bbba52ef771cea6770

Modified Files
--------------
contrib/pg_upgrade/pg_upgrade.c | 68 +++++++++++++-------
contrib/pg_upgrade/server.c | 13 ++--
src/bin/pg_dump/pg_dump.c | 132 ++++++++++++++++++++++++++-------------
src/bin/pg_dump/pg_dump.h | 2 +
src/bin/pg_dump/pg_dumpall.c | 39 +++++++-----
5 files changed, 171 insertions(+), 83 deletions(-)

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