pg_upgrade: preserve the timestamp epoch

Bruce Momjian <bruce@momjian.us>

Commit: 022aea346def58d5dd17dd0e012f925e8688d439
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-09-11T22:39:51Z
Releases: 9.4.0
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