pg_upgrade: preserve the timestamp epoch

Bruce Momjian <bruce@momjian.us>

Commit: a74a4aa23bb95b590ff01ee564219d2eacea3706
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-09-05T23:19:41Z
Releases: 9.5.0
pg_upgrade:  preserve the timestamp epoch

This is useful for replication tools like Slony and Skytools.

Report by Sergey Konoplev

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