postgres_fdw: Try again to stabilize aggregate pushdown regression tests.

Robert Haas <rhaas@postgresql.org>

Commit: f5d6bce63ceb3c59a964814bb0df5a0648e750e5
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-10-25T02:36:24Z
Releases: 10.0
postgres_fdw: Try again to stabilize aggregate pushdown regression tests.

A query that only aggregates one row isn't a great argument for pushdown,
and buildfarm member brolga decides against it.  Adjust the query a bit
in the hopes of getting remote aggregation to win consistently.

Jeevan Chalke, per suggestion from Tom Lane

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