Avoid row-processing-order dependency in postgres_fdw regression test.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 0247d43dd9c4ba3d2e121f98e3d5adcf769ab1e3
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2013-03-12T14:47:04Z
Releases: 9.3.0
Avoid row-processing-order dependency in postgres_fdw regression test.

A test intended to provoke an error on the remote side was coded in such
a way that multiple rows should be updated, so the output would vary
depending on which one was processed first.  Per buildfarm.

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