Attempt to stabilize grouping sets regression test plans.

Andrew Gierth <rhodiumtoad@postgresql.org>

Commit: de4da168d57de812bb30d359394b7913635d21a9
Author: Andrew Gierth <rhodiumtoad@postgresql.org>
Date: 2017-03-27T04:56:33Z
Releases: 10.0
Attempt to stabilize grouping sets regression test plans.

Per buildfarm members dromedary and arapaima.

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