pg_upgrade: preserve the timestamp epoch

Bruce Momjian <bruce@momjian.us>

Commit: 5724f491d2e02d6017e3101c9b7421437f2129e5
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-09-11T22:39:46Z
Releases: 9.3.6
pg_upgrade:  preserve the timestamp epoch

This is useful for replication tools like Slony and Skytools.  This is a
backpatch of a74a4aa23bb95b590ff01ee564219d2eacea3706.

Report by Sergey Konoplev

Backpatch through 9.3

Files