pgsql: pg_upgrade: preserve the timestamp epoch

pg_upgrade: preserve the timestamp epoch

This is useful for replication tools like Slony and Skytools.

Report by Sergey Konoplev

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/a74a4aa23bb95b590ff01ee564219d2eacea3706

Modified Files
--------------
contrib/pg_upgrade/controldata.c | 16 ++++++++++------
contrib/pg_upgrade/pg_upgrade.c | 8 ++++++--
contrib/pg_upgrade/pg_upgrade.h | 1 +
doc/src/sgml/ref/pg_resetxlog.sgml | 3 ++-
4 files changed, 19 insertions(+), 9 deletions(-)

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