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
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/3d2e1851096752c3ca4dee5c16b552332de09946

Modified Files
--------------
contrib/pg_upgrade/pg_upgrade.c | 58 +++++++++++++-----
contrib/pg_upgrade/server.c | 13 ++--
src/bin/pg_dump/pg_dump.c | 129 ++++++++++++++++++++++++++-------------
src/bin/pg_dump/pg_dump.h | 2 +
src/bin/pg_dump/pg_dumpall.c | 39 +++++++-----
5 files changed, 164 insertions(+), 77 deletions(-)

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